Creative Suite cs5 Master Collection OEM Succesfull buy?

I am looking to buy creative suite cs5 Master collection i want to know if any one has bought it from an oem site or some place cheap for like 300-400 dollars and it works. any one help me out? my dad said he bought adobe cs2 from ankhsoft.com a while ago n it works fine on my computer but they dont have have what i want for mac I need for MAC btw