While looking at the link it appears to go direct to macmall, in fact it looks like this:
http://www.anrdoezrs.net/click-3160356-10581103?url=http%3A%2F%2Fmacmall.com%2Fp%2FApple-Mac-Mini%2Fproduct%7Edpno%7E7761446%7Epdp.fdejafc
which definitely looks like the OP is getting something from a referral. If it had just been a direct link to macmall, then it would not have been an issue.