However, if you think of it purely from a volume standpoint... if you stuck 6 apples and 40 strawberries in a blender, I have a feeling that's gonna add up to significantly more than 32oz. Maybe they're really tiny apples...
Thats news to me. I mostly can weird stuff you can't buy off the shelf in America for obvious reasons, like peach rum sauce (basically a boozy peach smoothie) or brandied every fruit you can think of (brandied apples are my favorite)
Anyway buying individual serving fruit is probably going to be as uneconomical as buying single serving jam, pretty expensive.
When I buy a couple shipping flats of peaches, for example, its only a couple bucks each. Ditto crates of apples. At least in season. I think if you bought one apple at a time from a convenience store that could add up, but to keep an apples-to-apples comparison (groan) you'd need to compare that to the price of single serving jam packets, which are kinda expensive compared to an entire jar.
As others have said, there is huge savings from buying wholesale too.