Not from a store but a relative...my score today.
2000 rounds of 1952 linked 30-06
1000 rounds 1941 boxed 8mm
940 rounds of 1952 Greek 8mm Mauser
600 round tin of 30 carbine
I have all of them plus others. Nothing beats American firepower. Get what you can afford and afford to shoot right now. Mosin is probably the cheapest ammo when you can find it.