I'm a dealer and might be able to grab you a good deal from the distributors. Shoot me a PM with the best price you find, and I'll see if there's room for me to help out after shipping. *note.. The more stuff you want to place at one time, the better I can do. so if you wanted 3 of those, 2 for your 19 2 for your HK and 6 for your 22lr, I would be able to garantee you a better price than anything you could find online. You just have to make it worth it to pay shipping!
ETS now has Glock 42 and 43 mags, so if you're looking for extra range mags you could consider that. They also have extended mags. Iirc they have a 7 (flush), 9, & 12.