You absolutely can return for free for MAC.com.....Maybe it's a new thing, though, because I received this in my email:
So boo for hassle of needing to go through mail, but at least you're not stuck with product you don't want or having to pay for return shipping. Really excited to hear you like MM....mine arrives today!! I also got Puttin' on the Spritz. BTW-Hi!!! New to MAC, new to Specktra, and have been lurking through the last few days before launch. I got a way too big haul, but as a newbie, I didn't have almost anything.