Depending on the size of your pool and the materials you are using it would be best to consult someone else. The cheapest materials though would be plastic and using your own man power.
That last answer was not very helpful.
Installing an aboveground pool can cost $1,500-$5,000; for in-ground $7,000-$16,000 for a vinyl-lined model, $15,000-$25,000 for a fiberglass shell and...
Depending on what the pool has I would say around $500,000 for a good sized one and pretty basic.Like bollocks petal, i've had more expensive mac donalds that that. A public pool costs around £15-20...