I dropped by the TSC today, and started taking notes
The customer service rep did a walk-through of the water system parts with me and was pretty sure he can get all the parts I wanted, although he would like pictures of some of the parts because they don't keep it all in stock.
Also, the 3/16" stuff is uncommon there, but they have lots of the same components in 1/4" sizes.
The parts generally seemed to go for about $1.69 to $1.99 each, so it will be a bit more expensive than the prices quoted for Dwight Good's rat rack, but over all the prices seemed cheaper than similar items at Home Depot.
50 feet of 1/4" flex tubing was $21
Once I've got reference images for all the parts from AgSelect I'll go back and see about getting the exact amounts.
--Litter pans for breeding bins--
Pricers for litter pans were much better than those at Petsmart.
TSC Large Litter Pan: $5.49
TSC Jumbo Litter Pan: $7.99
Petsmart Jumbo Pan was around $14.99
--Food--
They didn't carry rat food, so I checked the nutritional values of the two largest bags of dog food.
TSC Brand Dog food: $15 / 18kg
Crude Protein: 21%
Crude Fat: 7%
Crude Fibre: 4%
Moisture: 10%
TizWhiz Dog Food: $24 / 18kg
Crude Protein: 24%
Crude Fat: 12%
Crude Fibre: 4%
Moisture: 12%
--Water Dishes--
The water dishes they have would be really good for an active snake
They have crock style dishes which are solid and bottom heavy. They range from:
Small: $2.29
Medium: $2.99
Large: $4.99
Jumbo: $5.99
Not at much info on the watering system as I'd like, but a good start toward pricing out a decent breeding operation.
edit:
Oh! I forgot to add that if they don't have the shavings you need for your snakes or rats in stock, they get their supplis from here:
http://www.pestell.com/
So anything that Pestell carries, they can order
The aspen shaving link on Pestell's site is currently borked though. I'm going to email them about i.