There is an online auction for WVO that people can use to find legitimate buyers and sellers of oil. They are similar to eBay but offer only bio-diesel items and functions a little differently.

I stumbled upon their site http://www.FillmoreFuels.com and think it can be a great idea for buying and selling WVO. They have a feedback section, so as the site matures, you will have more confidence in who you buy WVO from. They even have the option of trading items... for example: trade 10 gallons of WVO for 5 gallons of bio-diesel, etc...

No listings yet for my area or I would use it in a heartbeat to buy WVO instead of having to collect it myself. For those of you who live close to the WVO currently for sale, this site could be very useful for you.