If you've been contacted by a company offering to sell or rent your timeshare the BBB advises using caution, especially if an advance fee is involved. While these companies claim to have ready buyers or renters, imply they are representing foreign investors; or that corporations are interested, most are just offering to advertise your timeshare for sale. Do not confuse the service of an advertising or marketing company with those of a real estate company. In most real estate transactions it is the buyer who puts up a desposit and the real estate company gets its commission from the seller only after the deal closes. Ask if the company's salepeople are licensed to sell real estate or whether they are selling an advertising program. If you're contacted by a marketing service, don't allow the caller to pressure you into making a hurried decision. Request detailed written information about the company's services, find out where they currently advertise and visit other Internet listings the company may have. Most company's can not tell you whether a timeshare has rented or sold because these are generally "For Sale (or Rent) By Owner advertisements. Fees for timeshare listing services can range from $295-$600 with little guarantee that your unit will be sold or rented. Be sure to get all promises in writing, but remember that even then, those promises are only as good as the company that stands behind them.