Need line on 7.62x39 frangible ammo

The range I go to requires me to use frangible 7.62x39 rounds in my SKS and AK-47, but they charge an arm and a leg for them. Does anyone know where I can pick up 7.62x39 frangible rounds at a resonable price? I've been looking around on the internet and at local gun shops but haven't found any. Thanks for the help.

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