I would try Craigslist for the best used ones near you that won't cost a fortune to get. I would also check out your local paper for vehicles for sale in your area.
The best website for used concession trailers is probably eBay. There are almost always many concession trailers for sale there at great prices.
You can find concession trailers for sale online from the Commercial Truck Trader website. Alternatively, you can also find these trailers for sale from websites such as Used Vending.
There are several companies that sell used concessions trailers. Some used equipment stores also sell used concession trailers. Recently I have found several used concession trailers for sale on either ebay.com or craigslist.com. These sources are likely your best bet as it is difficult to find dealers of used concession trailers online.
Ebay is actually a good source for finding concession trailers in your area.
Lots of internet shops have concession trailers for sale, including eBay and Craigslist. Also, http://www.runwalkjog.com/nataliestrailer.htm has a very large listing of concession stands and trailes, used and new.
You can check you local newspaper to see if anyone is sealing or even giving away a used concession trailers. Search Craigslist for used concession trailers there are tons of sites that sale used goods.
eBay offers used concession trailers online. People are able to bid on these.
the best resource to get this information in Detroit is www.festivals-and-shows.com. one can Buy & sell used enclosed trailers for sale by owner free including landscape, car.New & Used Concession Trailers, Vending Trucks & Trailers, Mobile Kitchens, Concession Trailors are readily available.
Chances are that if you check Craigslist you'll be able to find exactly what you are looking for. Many companies sell concession trailers through this site.
Used Vending has an assortment of used concession trailers one could purchase. One can search within their results to find various trailers and carts to suit ones needs. Amusement Trader has many listed for sale as well.
You can buy concession trailers for a good price at: http://www.jrpconcessiontrailers.com/
Several guides for the purchase of a used concession trailer are available online. In short, yes, there is a market! There is a helpful eBay guide entitled "How to Choose a Used Concession Trailer".