You probably have seen this, but in case you haven't: you can get a $20 Whole Foods voucher for $10 through LivingSocial, which is one of those Groupon type outfits.
I find most of the offers unappealing: so far Mr FS and I have sprung for an art museum membership. Most others (for restaurants we aren't enticed by or for services--pedicures and the like--we don't want) we delete without reading. But we did get our voucher and hope Miss Em will take advantage also.
Here's the notice on a "Deals" site.