Hello Marlboro
I started a thread about Bilberries just recently, I think that all that was said in advice to me can be applied to Blueberries.
Up here in Lincolnshire, Wilcos are selling two different plants for £4 (Goldtraube and Brigitta) I bought a couple. The plants are relatively small about 6-9 ins. Personally I dont think the cost of the plants is very significant, I have found the cost of ericacious? soil, compost, and also the pots to keep them in far outweigh the plants. If you already knew all this then sorry to be repeating it.
Best Wishes - R