Yup. Go to walmart and pick up some 35 gallon tubs from sterilite or rubber maid. Cut out a large rectangular hole in the lid and zip tie hardware cloth to the inside of it. Voila! perfect rat tub for real cheap. Easy to clean and most of all, roomy.

For 1.5 rats, I would get 2 tubs for breeding females. 1.3 and 1.2. (Yes, get another male so he has a companion while the females are nursing) That's easily 3 tubs. Not what I recommend, but it can work.
Also, 2 extra tubs for the weanlings. They don't have to be 35 gallons, a 66 quart will suit them well if you plan on feeding or CO2 them to freeze for later. Make sure to separate them male and female.
If your going to keep the females together while they nurse (which it sounds like from your first post) you really should pull that male to avoid back to back breedings and stress from not only having another female in the tub, but also a male to contend with. Highly stressful for rats.
Some people think it's ok to lose pinks here and there, and to keep the harem breeding going for rats, but I can't afford to lose a rat here and there when it's easy to avoid the extra stress and keep the mothers alone to raise the pups properly with no competition.
I don't know if you plan to expand your rat operation, but if you are, then perhaps you should look into plans for a rack. It's a small footprint, and super easy to maintain, clean and have all of your rats in one place. A lot easier and made cleaning day a breeze!
Hope that helps you.