If you end up having to buy new check out Palmetto State Armory. That's where I got my last ones. Decent prices & shipping. Good folks to deal with. Their prices are about as good as you will find for new ones.
When I had a hard time finding reasonably priced G26 mags, I went another route.
G17 mags are $19 and a pair of extensions are about $10. I have two 17-round mags for my G26 as spares if they are every necessary. Total cost was $48 verses $56 or more.
It actually makes better sense than using G26 mags as spares.... If I am ever in a street situation where I need to make a mag change, I'll take the biggest round-count mag I can comfortably use ala G17.