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 
