As for heating, a lot of people have separate fish rooms and use ceramic heaters.
Also another way is large shallow (and clear) plastic tubs filled with water + aquarium heaters.. but the water gets scummy and a chance for unwanted insects breeding and the humidity is bad in summer.
Flexwatt heat tape
is also used by many breeders, placed on each shelf with a thermostat to control the temp.
Heating all the jars/containers is vital, so any of those 3 ways are what you are looking at if not using a barrack system.
Price wise - cheapest is probably the separate room, the electric bill will go up some (will anyways with breeding), the next cheapest is the container thing, but that takes up more space and depending upon size (how many) of containers the price can go up considerably for the heaters.
The Flexwatt isn't so bad, and depending upon amount you need can run from $130+.
The heat tape, certain ones like the Flexwatt is safe to use, it's protected - and as long as you get the clips and electric/aluminum tape, thermostat, then you shouldn't have any issues with water, etc. GFCI outlet or portable plug (can purchase at Lowe's or Home Depot for under $20) is a good idea to help prevent getting fried by short circuits.
Seedling mats are good as well, water proof.. just a bit more pricey. Will also require a thermostat.
It all depends on how much room you have available to breed (needs LOTS) and how much you are planning to breed (to see what would be easiest for container heating).