I know one of the seed catalogues has them in (damned if I can remember which one!!) but Welsh fruit stocks do them as well
http://www.welshfruitstocks.co.uk/ac...nts.html#rasps
They're not cheap but at least you'll get some crop & they will be better than Garden centre bought ones which you won't get anytjong off for two years (plant this year, grow next, fruit the following) I'd get a mixture as well Early, mid & the autumn croping . that way you'll have them longer. The autumn ones will fruit next year so that 's a bonus.
Blackberries - I never answered your query - They are pretty prolific any way. If you've got a shed on your lottie you could get a particularly viscious one & train it so it acts a shed security
