here are the best, most readily available, and mostly cheapest, in no particular order. These typically if asked by dudes who shoot rimfire alot(like me), will tell you , that across the board , with many diff rimfire rifles, these will give you great results.
eley ammo-many types
aguila -many types
golden eagle
remmington, orange box or yellow box.
All the above are made by eley, in diff countries.
then you have cci- many types.
wolf- which is also sk/lapua/etc.
american eagle red box- which is made by federal.
stay away from ALL OTHER REMINGTON AMMO!!!!
for bulk box ammo, try diff types of winchester, and federal
stay away from any CCI BULK AMMO!!!!
with all the dif types of eley, cci, and aguila, this list has about 40 or so diff types of ammo for you to check, and it should all be under 5 bucks per box, unless you start buying the really expensive eley ammo, which can go for 10 bucks a box.