I didn't check into the cost of rounds, but I just bought a 15x30 oval and it cost $4500 just for the pool, pump, vacuum, etc....Still going to cost another $1100 for installation plus $595 for electric.....

I guess it all depends on the manufacturer / model you choose. I could have gotten the same "size" pool ranging from $2000 - $6000 depending on walls, top rails, liner, etc....