Amazon Guitar Hero 3 deal

Amazon is selling Guitar Hero 3 for 49.95 right now which is 50% off. Not sure how long that deal is going on.

http://www.amazon.com/gp/s//ref=amb_link_82836351_2?ie=UTF8&search-alias=videogames&hidden-keywords=B000TGDHVY|B000TG531G|B000TG92YK|B000TGB4UU&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=right-3&pf_rd_r=11AXGXT29WX0BJAY7YNQ&pf_rd_t=101&pf_rd_p=464837051&pf_rd_i=409566