These see-saws are selling for $9 at Kmart Chatswood, NSW and presume are the same price in other stores. I bought one and they are pretty good. They also rotate in a circle which the kids love and I'm just waiting for one of them to get bowled over! Great value.
Powdercoated steel frame with plastic seats. The pegs in the ground are small so useless, but I intent to just get a couple of treated pine sleepers and put them in the middle and bolt the see-saw to it.
Duplicate
http://www.ozbargain.com.au/node/95071