make sure you check the descriptions and feed back. Make sure you are not purchasing a pirated copy. I have seen where people sell info on how to obtain a pirated copy and they dont actually send you anything, just an email on how to get it yourself. Contact the seller to be sure this is not the case...make sure they have an actual factory version. If this is the case, then i dont think $100 is a bad price. The newest version is $249 i think...so u make the call.