A lot of loaders appeared on the market starting around five years ago. But the majority of them were actually Czechoslovak ZB magazine loaders. The Weapon and most of the special combination tools and the loader were essentially copied for the Bren designs. Places like IMA and Sportsman’s Guide had tons of ZB parts kits with the tools and loaders available until fairly recently.
The Czech version will have a small circle mark with a "Z" in the middle.
IMA still shows to have the loaders in stock for $29.95 with a teaser that some have Nazi WaffenAmt inspectors markings. A real bargain if you need one to fill a box. Not sure if the ZB loader will accept Bren magazines or not for actual use. The last pattern ZB had curved magazines that looked identical to the Bren pattern but earlier designs were straight due to using a different cartridge.
Link below for the IMA version:
http://www.ima-usa.com/zb-magazine-loader.html