With the latest insanity that is upon us, you'll pay a premium for waiting till this late date to shop for magazines. Hopefully you have enough magazines for all your guns that you're not in panic mode.
Old GI mags are usually cheap, and work ok. Some require some cleanup and spring or follower changes. Megar magazines are usually inexpensive and work as well as most. At this time if I needed mags, I'd even try Pro Mags------gasp! McCormics are close to $30 for the Power Mags. The Tripps, Wilsons, and Metalforms, are in the $40-$50 range. That's IF they haven't jacked the price up on them already. Baddddd time to buy magazines.
Good Luck,
Savage