I was looking for new trackballs and a Carbon Fiber body on Amazon for my BB Bold and put together a list of the top BB products. Top Amazon BlackBerry Products
Everyone and anyone can make their own list too. Maybe other people can post theirs.
I included unlocked phones, hardware/parts, memory cards, covers/protectors.
Most of the covers i have included are designer ones. They have cool designs and what not on them.
I highly recommend amazon as well. They stand behind their customers and are easy to dispute payments with. Never had a problem and have purchased at least 10 items to date.
Post your own list if you'd like.