What store sales paintball guns?

Answer 1

Usually specialized paintball "pro shops" that sell paintball markers, paint[balls] in quantities of 2000 or so, paintball gear (apparel, safety googles air tanks), and may offer refills for air tanks. Usually there will be one within a paintball field or pretty close to one, and some may may be miles away from the nearest field.

Answer 2

A lot of paintball fields have proshops in them, as well as independent paintball stores, Army-Navy stores, and some sporting goods stores.

Answer 3

Walmart