You could always try down-loading the 7 Mag. If you don't handload, make friends with someone who does and try some reduced loads.
If you get a buddy to do it, the most it will cost you is a set of dies ($25 - $30 if he doesn't have the dies), a box of bullets, a pound of powder, and some primers. The dies last forever, so you only have to buy them once.
Bullets $20 - $35/100, primers about $3.50/100, powder $22 - $30/lb. A pound of powder should load close to 100 reduced 7 Mag loads, maybe a few more.