40mm grenades that don.t cost a fortune?

ICS do a box of 6 for cheap, check zero one.

 
also have a look at some of the S-Thunder grenades as they're cheaper and hold more bbs

 
I've got some Pro-Arms shells that are extremely reliable, made of plastic (hence light weight) and came in a pack of 3 that cost less than 1 madbull. Highly recommended.

 
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