I hired a birthing pool and it cost about $100 at the time. This was for a large steel framed pool with a liner inside. This included all the hoses for filling and emtying the pool (which connected to the landry taps). Well worth the money, but you could certainly purchase on at the shops. Just make sure it is big enough to move around in. Also, if you labour for a couple of hours in the water, you might want to think about placing a mattress or beanbag under it as the floor can get hard. Our hot water ran out, but we just filled the pool in two phases (knew to do this as we had a practice run). We had a number of urns which we earlier filled and heated, filled the pool until the hot water ran out, covered it with bubblerap and waited for the hot water to re-heat (took about an hour or so), topped up with our urn water and then filled the rest of the pool with the next lot of warm water. We kept the urns hot and topped up as we needed. This process did take some time, but the reward was a pool which had enough water to sit just under my breasts while in a squatting position so I was able to freely float, change positions and enjoy the water.
Also, my midwives carried a kit, including oxygen and all the required resus and drugs eg for bleeding etc.
Hope this helps.