Fiberglass Box Help

ok i'm making a fiberglass sub box for 2 12s and an amp is there anywhere to buy 12 speaker rings out of mdf i can't seem to find any also this resin is expensive any suggestions on where to get it cheaper any tips would be appreciated

www.able-audio.com has speaker rings

I'd make them yourself with a perfect circle jig for a router.Dont use a spiral saw it will rip the to shreds or make them a mess.As far as resin goes: yeah, check the date.Don't cheap out on fibreglass stuff.Evercoat is great stuff,but isn't cheap.Use a little resin with some hardener as a test,if it wont harden with the proper ratio's in the right temperature then it is no good ,then take the resin back to the store and bitch at them.They cant expect you to pay for some useless product