How am I just now finding out about this?!?!?

All these years of Finger loading 1 Pellet at a time in Multi-Pump air rifles with my big hands just to find out that they had 5 shot magazines for them the whole time.......I got a 760 Pumpmaster today and realized it has a 5 shot magaine for Pellets!! And it also fits I'm other models like the 66 Powermaster and the different model of 760 pumpmaster I also have...I need like 20 of these mags..anyone know where I can get more??