Yeah kinda hard to find tho the first ones I found weren't made my glock but I ended up finding this one on cheaper than dirt
+1 on that and you get free shipping! Also don't be discouraged if you cant get all 22 rounds in at first I had to load mine up with only 20 for the first few times until the spring loosened up a bit. It still is a pita to get the last 2 rounds in but I find it easier to do them with out the speed loader.
Here's a couple of pictures of my G23G4. I polished my barrel & installed a S.S Guide Rod from Glockmeister. And a SGM Tactical 31 round mag. Here soon I will be ordering the Lone Wolf conversion barrels in 9 & .357