I think you are correct, but for some reason it sounds discordant to my sensibilities. Maybe my sensibilities just aren't that sensible? It'll take a while to g

I think you are correct, but for some reason it sounds discordant to my sensibilities. Maybe my sensibilities just aren't that sensible? It'll take a while to get used to 'for cheap' being considered proper. However, this use is in fact supported: adverb: cheap at or for a low price. "a house that was going cheap" "going cheap" sounds okay to me but "for cheap" doesn't, but I suppose that's just all in my head :)