If you are handy with some wood and tools, building it yourself will be cheaper. Obviously the quality will be dependent on your craftsmanship and the quality of the materials you are using.

The animal plastics racks are very nice quality and their price reflects that. If you can afford and are willing to pay that much for a professionally made rack, then go for it.

If you wish to go the crafty route then go for it. I built my own rack over a year ago and it is still working wonderfully. They are pretty simple to build there are a few tutorials on this site and on other websites.