Since everybody is talking about it right now, here's a link to a free sample from WalMart:
FWIW, I loved it when I first started using it, but now I'm meh on it. I have combination skin, and this felt heavier than my normal liquid foundation. It did give me a nice glowy/dewy look, though.
ETA: scroll down for better link

Re: PSA: Garnier BB cream free sample
Oh, hmm...I got to it from this blog post, so maybe follow their link? It opens up a WalMart page with a big ad, and then there is a button to click in the ad that says "free sample."
http://free-product-samples.blogspot.com/2012/05/walmart-garnier-miracle-skin-bb-cream.html
i just tried it and the link worked.
Thanks, I look forward to trying this!