I think I might know why the JB site isn't allowing for store pickup anymore. At the top of the product pages and search page it says (to me) that it has a new delivery feature, of "shipping" it to the store. Which sounds like they are trying to earn the extra shipping money they charge for posting items to homes, but now for all items, including the items that were going to be shipped to the store with their regular deliveries anyway... which if true, is a disgusting cash grab.
I will have to make some enquiries about it.