I like the credit somehow, whats the point of asking a source to send gear to be tested if they know it will be??? I'd prefer to keep this honest and test without personally knowing im being tested. I'll personally replace the bottle or pay for the kit to have every single one of my products tested. But I don't want to know until after the fact, that way you're testing what everyone gets, not what a source knows will be tested.
Im serious
You are the first lab to offer. I hope you are starting a trend!
Anyway, I wouldn't turn down store credit at PEP for the cost of the test plus shipping.