I'd also like to see Glock make super-high cap G18 style mags in 10mm, .357 SIG, .40, etc.
The 10mm and .45 ACP are a different magazine size, so that's not available.
The .357sig and .40 S&W use the same magazine body with a different follower, so you can easily buy a 33-round Glock 17/18 magazine, dissassemble the mag, change it to a Glock 22/23 follower and load it up with .40 S&W or .357sig rounds.
I believe there's an aftermarket extended capacity magazine for the Glock 21, which you could convert to 10mm with a follower swap, but that's not a glock made item and I don't think any are pre-ban.