I built a 72 slot hatchling rack for less than $200. That doesn't include water bowls (I got a really good deal on ceramic ones when I was working at our local pet store), but does include everything else, including heat tape. I went with 11" back heat and it works really well for them.
They are housed in the Glad containers, and I find the hatchlings do really well in this size of bin. Never had any problems with feeding.
As you can see I hadn't finished putting in all the bins, or attaching the backing, but you get the idea. And another great thing about using these "disposable" bins (they go on sale for $3/pack of 4) is that when somebody purchases a hatchling, you can send them off in their current bin. I just keep all the lids on the top shelf of the rack.
Only drawback to this rack is that it is HEAVY, and you would need to be very careful when moving it.