you can easily build one out of melamine wood (no tops on tubs) or ply wood (recommend lids on tubs) just search youtube for some videos and you will get the general idea...
not to argue with Orange Ghost, but professional ones are overpriced, yes they are very nice looking, but my chipped up one that looks like a baby did it, works just as well.
i have a hatchling rack, and an adult rack (no longer in use) and each one costed less than $100.
this is my old one, it was made out of aspen boards and painted brown.
adult rack with tubs in it.. i used lids because the humidity would warp the boards..
hatchling rack. this is the begining of it.
It's really not that hard to do... im sure your dad, brother, or someone you know has tools you can use, OR all you need is a decent power drill.. most hard ware stores will cut the wood to your needs for free.
i used heat tape for the heat sorce, for the adult racks i had 11'' down the back, providing back heat..
i use 3'' strips on each shelf on the hatchling rack for belly heat...
hope this helped!