B1G1 free is a pretty rare sale...Probably once a year if we're LUCKY..I remember gamestop threw a B1G1 free used last year, but the site was so heavily hit the first couple days, and almost everything went out of stock that they ended the sale a couple days early.
The only company that i can point out that throws B1G1 free sales frequently is blockbuster, but thats on 14.99 and under.