The 10mm is a great cartridge!
Had a Glock 20 and I actually cut the grip frame down to hold Glock 29 10-round magazines, but the original 15-round magazines still worked fine.
Sold it, but still had about 1000 Hornady reloadable bullets and the dies, so I got the .40 Shield which still can use the bullets & dies.
I sure hope you can find some standard capacity magazines pretty soon!
I also hope people who are going to turn 21, (purchase age here) and are thinking of purchasing anything that holds more than 10 rounds, know that one can own those magazines right now I believe.
I got several more 30-rounders for my AR-15 and was considering giving some to my young niece, then when she turns 21 she'll be all set!