Unfortunately, TD is (afaik) the only online place for us living in CA who still don't charge taxes. Personally, I've bought plenty from them and never had any problems with purchases/game codes except shipping is usually slow.   

Pgcmoore
 
have you tried NCIX? they have a site for Ca and USA, not sure about taxes there but you may want to check them out. I have only purchased a few items from them but there service was ok, AND there shipping was also slow, if you ever need an alternative. But if TD is treating you well, stick with them. All businesses are only as strong as every person that they employ

Thanks for that Pgcmoore, but yeah ncix us definitely charges tax to CA. I actually did use ncix Ca in the past when I couldn't find particular water blocks anywhere, but the item took about 2 weeks to get to me lol. Mostly, I've just put up with the extra cost (hard to escape it out here) from amazon and the egg. TD, as of late, has been my last resort unless the budget is real tight.      

Seems to me like employees are taking those codes and reselling them.

FINAL UPDATE-
 
It gives me great pleasure to announce that my problem has been solved.  After a false promise from the TigerDirect B2B sales agent, i decided to take it a step further.  I got in contact with the BBB and the FTC.  It did not end there and I decided to go even one step further.  This last step was what finally resulted in me not only getting my promised code for MGSV, but also something extra in my email .  I got in contact with the CEO of NVIDIA himself and explained to him my problem professionally.  Needless to say, in less than a few hours everything was taken care of quite satisfactorily.  They went above and beyond what was expected.  This is one of the reasons why i have enjoyed doing business with NVIDIA since they bought out 3Dfx back in 2002.  So if you ever doubt yourself and feel that your voice does not count, that no one will listen because your just a little fish, make sure that little fish is a piranha and don't give up.