$10? Are you serious?
http://search.digikey.com/scripts/Dk...;keywords=2032
Most expensive one there is 1.73 for one, prices drop starting w/ quantity 10.
I've seen a lot more damage from Alkaline & Nicad over Lithium, but that's in arcade hardware. Haven't opened up that many carts w/ batteries. I know that I have many battery-backup cartridges that amazingly still work after 20+ years.