I got a 10mm gen4 FDE G20 on layaway I am keeping an eye out for deals on ammo which is very hard to find a so called deal on 10mm ammo these days. Might want to consider getting into reloading if I wasn't a reloader I wouldn't own many guns 10mm being one of them.
If you really want some 10 mm to save as collectable get Winchester Black Talon! You can find it on gunbroker.com it is packed 20 rds per box and is over fifty dollars a box! It was the ultimate ammo in the 1990s before being removed from shelves. I have some 9mm & .40 as a collectable maybe it will save my life one day. If you have money lying around I would get a couple boxes.