Crutchfield: $20 off $100 Coupon Code 

Your Special Offer is $20 off any order over $100.


You must be at least 18 years of age and purchase over $100 in merchandise from Crutchfield exclusive of any shipping, handling, and taxes to take advantage of this offer.
Offer valid only when you pay with your MasterCard.
Claims from dealers/distributors, their employees, groups, clubs or Crutchfield employees will not be accepted.
Not applicable toward any prior orders you may have placed with Crutchfield.
This offer may not be combined with any other Crutchfield offer.
This offer can only be used once.
Offer only redeemable in the U.S.
Void where prohibited, taxed, or restricted by law.
Applicable taxes must be paid by bearer.
Discount may not be used on the following brands/products: Apple, Alpine, Beltronics, Borla, Bose, Creative Labs, Denon AV-5308CI, Eclipse, Escort, JL Audio, K&N, Kicker, Klipsch, Mirage, Polk Audio, Rockford Fosgate, select Sony items, Velodyne, Thiel Audio, Thule, Tom Tom, Yamaha, digital cameras, camcorders, MP3 players, video games & consoles, pre-paid installation & programming services, gift cards, "scratch and dent" or "outlet" items. Not combinable with other discount offers. We retain the right to cancel and/or modify this offer at any time without prior notice.
We retain the right to cancel and/or modify this offer at any time without prior notice.

Good, that Pioneer Deck for the wife's car will do just fine!

I've got both Mastercard and Visa, so I figure I'm in the clear.

Now it says:

Discount may not be used on the following brands/products: Alpine, Apple, Artison, Beltronics, Borla, Bose, Definitive Technology, Eclipse, Energy, Escort, Focal, JL Audio, K&N, Klipsch, Mirage, NAD, Pioneer, Polk Audio, Samsung LED TVs, select Sony items, Velodyne, Thiel Audio, Thule, Tom Tom, Wadia, Yamaha, digital cameras, camcorders, MP3 players, video games & consoles, pre-paid installation & programming services, gift cards, or Outlet Store items. Not combinable with other discount offers. We retain the right to cancel and/or modify this offer at any time without prior notice. Limit one per customer. Valid only to end user. Offer not valid for product resale. We reserve the right to limit quantity.