I don't have much experience with it... but yes, it can be a great tool for Marketing.
I would advise you to keep your personal FB separate from your Business one however.
I've been experimenting with http://www.yardsellr.com which allows you to showcase and sell your items without the listing fees of either Ebay or Paypal. (unless you want to get your payments via paypal)
It also ties to your facebook account so you can have the yardsellr link right on your FB page. They have these things called "photon$" which you earn various ways, sellers can upgrade their listings (pay $2 to $10) to have their items boosted to the top of the listings, promoted, and even showcased. In return you get photon$ to give to potential buyers. The photons act as $$ off the purchase.
The buyer collects photons, finds an item they want, and uses the photons toward a purchase. The seller gets the full amount he's asking for. So if you list a knife sheath for $50, plus $8 shipping you get that in payment. But the buyer can use up to $50 worth of photons toward that and get the Knife sheath for $8 shipping and a "Yardseller slice" (a fee the buyer pays) Anyway, it seems to be good for a person who doesn't want to mess with a website of their own, for one of a kind pieces... and hand crafted things. check it out.