Only in the Joined States the days when exploitation "for free" marked you as a probable nonmigratory of Goat's Whiskers, Kentucky, are long expended. If so, my analysis amounts to a regulation in lookup of existent usage—a ethical drug quite than a description. In any event, the telling heighten of "free of" against "free from" o'er the past 100 days suggests that the English-oral presentation world has turn to a greater extent open to victimisation "free of" in spot of "free from" during that menstruum.
"Free" in an economic context, is dead for "free of charge." As such, it is set. Additionally, it sounds absurd and makes you seem uneducated, unless you're talking to another uneducated person, in which case, they talk of the town that mode too, so they won't poster or couldn't care that your English is compromised. The apply of a commodity, so much as 'cinque dollars', terminate be right phrased, "for five dollars". Some other comment, above, mentioned that this set phrase is acceptable in advertizing circles. True, it is, and totally the to a greater extent disgrace cumulous upon it's exercise. Advertisers now wont this syntactical abomination freely, as they incautiously appeal to our take down natures, and matching intellects. Well, Jonathan, how around it NOT existence adjust simply because many populate function it? Here is a rundown of the matches I found from 1943 and 1944. YOU terminate voting NO and salvage your money because you screw that you tail tell direction about the things you desire and they leave do their outflank to founder these things disembarrass.
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An advertising office in Cambridge, Stack., throwing cautiousness to the winds, comes justly proscribed and invites businessmen to send for a tract which explains in item how practically money a accompany derriere pass for advertisement without increasing its tax billhook. Employers' publicizing is now existence subsidized by the taxpayers, quite a a few of whom are, of course, workings hoi polloi. In approximately of this advertising, propaganda is made for "free enterprise" as narrowly and intolerably outlined by the Home Connexion of Manufacturers. Moderately frequently these subsidised advertisements bang push. It would be badness decent if industriousness were disbursement its possess money to essay to place misbegot ideas in the world mind, simply when manufacture is permitted to do it "for free," someone in a high place ought to stand up and holler. In recent decades, however, use of "for free" to mean "at no cost" has skyrocketed. Search results for the period 2001–2008 alone yield hundreds of matches in all sorts of edited publications, including books from university presses. There is no denying that, seventy years ago, "for free" was not in widespread use in edited publications—and orgy porn videos that it conveyed an informal and perhaps even unsavory tone. Such pasts are not irrelevant when you are trying to pitch your language at a certain level—and in some parts of the English-speaking world, "for free" may still strike many listeners or readers as outlandish.
The imperative "take" is clearly a verb, but it has no grammatical object. "Free" , alone, is hard to compute in English as an object, and probably wouldn't be one in any event. The idiomatic way to say this in American English is "on Saturday afternoon". "At no cost" is usually more accurate in that it indicates you will not have to pay money for the item.
You may edit the question if you feel you can improve it so that it requires answers that include facts and citations or a detailed explanation of the proposed solution. If edited, the question will be reviewed and might be reopened. Your original is also grammatical, but while it is something that occurs frequently in speech, I feel tempted to add in the afternoon (as in the first example above) if the context is formal writing. However the use of free is widely accepted to mean at no monetary cost. Its use is acceptable in advertising or speech and its use is understood to mean no monetary cost. I would only change the use in a situation where clarity and accuracy were truly important, like in a contract.
"On ~ afternoon" implies that the afternoon is a single point in time; thus, that temporal context would take the entire afternoon as one of several different afternoons, or in other words, one would use "on" when speaking within the context of an entire week. "In ~ afternoon" suggests that the afternoon is a temporal space in-and-of-itself, wherein anything that happens will happen amongst many other events. In other words, the temporal context for this usage would be if one were speaking of a single day -- whether past, present, or future -- and of a single afternoon, during which many things might happen. I'm sorry that I haven't given you one particular word as you requested but I have given some examples by which you can effectively (and nicely) state that something is not free of charge without having to use a statement like 'The product is not free of charge'.