I don't think SU! will sell them, but they have replaced missing ones & defective ones for me. I found blocks at a stamping convention last summer & I have a local store that sells them as well. DH has a wood shop & has told me over & over again he could make blocks for me, but has yet to follow through on that. I'm still waiting for my stamping chest to be finished! :lol: Try
www.vivalasvegastamps.com. They sell unmounted stamps & I think they sell the blocks as well.
Suzanne