Tub idea
I made my own cage and it costed a total of 18$. We went to Big Lots and bought 2, 1 1/2 ft x 3 ft Tubs and they are 1 ft tall, we drilled many 1 inch holes in the side for good airflow, and connected the tubs together buy using an old coffee can. The cage is about 9 sq feet and plenty long so the pigs run and popcorn all the time! There has been a big controversy about my cage but it's perfectly safe and the pigs love it. For the lids, we drilled large 1 ft holes all over the lid and put wire over the holes (we didn't removed the middle of the lid completly so we could have some middle to support the wire.) because the lids came with the tubs, they snap right on. It was easy to make and cheap! All you have to do is drill about 10 holes on the sides for air flow, a large hole on the short side to fit a coffee can (make sure the coffee can end is smooth and will not hurt the pig after cutting it out) If it's easier for you, buy a small (or depending how long you want the tunnel connecting the tubs) piece of LARGE PVC pipe, make sure the pigs can easily get through it, even after they are adults.
The tubs are also very easy to clean. If you can't have someone watch the pig while you clean it, find the lid to the coffee can or something similar to block on end of the connecting pipe. Then you can clean one tub at a time. I just dump the bedding in the trash, hose down the tub, and dry it off. Because the tubs are light, it's easy to carry.
Good luck! A remeber, the cage should be at least 7 1/2 feet for a pig, so if you re going to use this idea, PLEASE get
2 tubs and
not one! the cage should lok something like this. Once I get pictures I'll post and you might understand better
[_____________]==[_____________]
(tub 3ft side) can (tub 3 ft side)