I used my 10% discount coupon on a $2,000 invoice and got a $200 savings. But the 10% coupon has a maximum value of $800. Can I use this discount coupon for another purchase?

Unfortunately, no. As discount coupons are for single use only there is no residual value to any used coupon.  Although a 10% discount coupon has a maximum value of $800 it is not a gift card in the amount of $800.  Therefore, it is so important to carefully plan when you will use your discount coupons.  We encourage you to use your coupons in a way that maximizes your savings.