That's a great coupon, the one I had was only worth $20, but is good for black units, also. If you absolutely must have a black SB3, try coupon code CPRROCKS.
FWIW, I started out looking for a used one also, but the difference between what people wanted for used versus new was so small it made more sense to buy a new one and get the warranty, especially if you have a coupon.
