DSST- Buy two get one free if purchased by 6/30/17

[Ideas]

so you don't have a problem with ..
"Promotional vouchers must be redeemed by September 30, 2017."

because that would be past my limit
I guess I'm just lazy

That would be only 3 exams per 5 weeks if someone took them all by Sept 30, but you probably have months after redeeming the voucher. That is how it works with CLEP anyway. 6 months from registering.