What is the average cost of a 20' x 40' in-ground pool with a vinyl liner?

You can buy an 20 x 40 inground vinyl swimming pool for around $6000 http://royalswimmingpools.com/kit_rectangle.htm ; the basic swimming pool kit includes everything you need to build and operate your swimming pool except sand, concrete, PVC piping, an electrician and water. Check out pictures of homeowners' installing it to save money http://royalswimmingpools.com/construction.htmv hope this helps