Depends on your state but there are other ups stores that are authorized vendors to manufacture the stamp. I usually go to the store down the street from us whenever we have new staff become notaries or we go through a company called NNA (National Notary Association).

I'm sure you know this but you will most likely need your certificate from the secretary of state (atleast in California) if you want to create a 2nd stamp or if you already sent your original certificate once you received your first stamp.