Where to buy MAC foundation?

[Luscious]

I would like to try MAC's Studio Fix wet/dry foundation. I know I could just go down to the mall, but I was wondering if there are any good online deals for (genuine) MAC mu? I like to save a buck when I can, KWIM...

 

[little teaser]

you could try ebay but if this is yor first time it would be better to go get match for the right shade