Do you know this Silk Road alternatives:
BlackMarket Reloaded
Atlantis
"If you can't innovate, you just imitate."
Depending on the value of Bitcoin it's approx. 400ish € for a seller's account.
Anyway, as mentioned above as a buyer you don't pay fees, well, except the seller charges extra for postage etc., but I wouldn't consider this as fees.
As a vendor you don't have to pay fees, as long as you set up your account correctly, but on the other hand the clients would have to pay them, it's the so called "pre-commission".