I just bought a pool from Payless Plastics, they are bigger in circumference than an actual ''birth pool " so use a bit more water. It was great and I thinkit cost us $50 . Hubby pumped it up till the sides were quite firm and they were perfect to lean on, I had no problems whatsoever, and boy was I leaning lol.
I know a few ladies who have also used pools from The Warehouse.
Good on you for going for a home waterbirth, I had one in January and it the best experience