Which Magic 3.1 Mod Chip Is Real?

Does anyonw knows which mod chip is real becuase I see different prices for them. Here are the links

*http://www.xboxmodchips.net/ps2.html the price is $30.00

*http://madkao.com/index.asp the price is $36.00

*http://www.easybuy2000.com/store/pla...0modchip.shtml the price is $44.00

*http://www.gamegizmo.com/products.ph...atID=1&pID=460 the price is $45.97

*http://genomods.com/proddetail.asp?prod=magic31&from=7 the price is $49.00

*http://www.modchip.ca/products/ps2/magic3.php the price is $54.95

*http://store.unet.net/shop/showdetl....ID=215&CATID=2 the price is $59.97