BB's are easy to get, heck they're available at Canadian Tire and Walmart. NEVER BUY THOSE. They are made with seams and will chew up your hop up and inner barrel.
The ones you should be looking at are BB Bastard (Canadian made) which a lot of players swear by. Good BB's will be seamless and should not have air bubbles in them or minimal air bubbles.
A bag of 2000 BB Bastards should run you something like $10.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE