For those looking for a good rep, I used Brian at X4024. He had no problems combining the free cam, 15%, and $20 referral (even when I ufked up the code, and had to go look for it online again, lol). If anyone is looking for a good code, I dont think mine has been used...
As far as the 15% discount - you just need 3 pioneer items over $49 bucks. On a large navi order, dont be afraid to throw in a $49 set of pioneer speakers (or whatever) to get the 15% discount - the discount will save you more than the $49 item anyway.