Im going to need help and LOTS of it.

[Neal]

Well I had my son clean off his long dresser so I can put 3 bins on there.

I don't even know where I would get a rack in Canada?

I can get 3 UTH's...I will also need 3 rheostats, right?
I was hoping to do this cheaply since they're not my snakes but it doesn't look like that's possible.

I guess 3 of everything it is!

You can use rheostats or a dimmer switch, but it'll be not recommended on here, though I use them and I know several people who do without any issues. The thing is they can't count for room temperature change so if the room stays a stable temp then it's not a huge deal. You definitely need a thermometer for sure, maybe an Infrared Temp Gun may be better for you since it's very accurate and you don't need 3 of them. One thing to keep in mind though about the infrared temp gun is you can't shoot reflecting surfaces, otherwise it'll give you back a false reading. I mean like a shiny metal surface or glass, stuff like that.