If you have access to the big warehouse food outlets (BJ's, Costco, etc.), this is the time of year they sell the whole fresh berries in the big bags pretty cheap (4 or 5 lbs, maybe, it has been while since I bought the big bag). If you buy them out of the freezer section, I believe those have been flash-frozen which means that the cell walls don't get broken up very much and you don't derive as much benefit than if you froze them yourself. If you thaw a bag of frozen fruit and you end up with a sloppy mess, then either it wasn't flash-frozen, or it had thawed somewhere between the factory and the freezer.