I got a 10 round one at dicks. Personally I would prefer a flush fitting one over the 10 round one.
Even the 5 round Savage mag sticks out a bit. If you want flush fitting, you need to be looking at a Marlin Model 60 or a Ruger 10/22.
You could also try Gun Clip Depot (http://www.gunclips.net). They have good prices and ship the same day usually.