Assumptions.
#1.
The coupon must be for the specific product and not the order.
#2.
the rebate mentioned is instant rebate.
They have to pricematch before you use your generic coupons. Say you order 2 items.
One of the items you pricematch. If your order is over $150, you can still use your $30
off $150 coupon. The coupon applied is not for that pricematched item, so you are safe.
The applied coupon is for the whole order.