I know when I signed up at Vircurex.com I had trouble finding a code.  With a referal code you save 0.05% per trade.  Anyway, If you need one, the code is: 260-146
Also a referal link: https://vircurex.com/register?referral_id=260-146

If you like trading Altcoins, it does offer more options and coins then any other site.