The average cost to sell and transfer a timeshare can vary widely depending on factors like the timeshare's location, size, and the company or agent you use for the sale. On average, you might encounter costs such as:

1. Listing Fees: These can range from a few hundred to over a thousand dollars, depending on the platform or agency you choose to list your timeshare.

2. Commission Fees: If you use a real estate agent or a timeshare resale company, they may charge a commission, typically a percentage of the sale price, which can be 10% or more.

3. Maintenance Fees: You'll need to continue paying annual maintenance fees until the timeshare is sold.

4. Closing Costs: These fees can include title transfer, administrative fees, and more. They vary by location and resort.

5. Marketing Expenses: If you choose to advertise the timeshare on your own, you might incur additional costs for marketing and promotion.

6. Legal Fees: If you need legal assistance in transferring the timeshare, this can add to the overall cost.