Where can I buy the fruit, not seeds, of certain bramble varieties?

I know its not the season right now, but wondering if anyone has bought any tayberries / loganberries / boysenberries fruit etc and knows where I can get them? I'm fascinated by blackberry-raspberry hybrids as blackberries are my favourite fruit and I love raspberries, but the house I'm buying doesn't have a huge garden. If it were up to me I'd grow them all, but due to limited space I can only grow one and I don't want to invest time in growing each variety just to end up preferring a certain one. I've tried looking online but I can only find seeds or grown plants, rather than actual fruit. I don't expect anywhere to have any fruit available right now, but if anyone has any suggestions I would appreciate them!