Your friend needs to do some serious thinking.
If he cannot afford two enclosures how will he afford to breed them? lol....it costs TONS of money put into a pair of snakes to produce a clutch. And then more money to buy the supplies needed for the eggs and hatchlings. He is irresponsible if he is going to breed when he cannot even afford 5-10 bucks for a rubbermaid.
His excuse of "I want to breed them" has no bearing on keeping them together. When you keep two snakes together you are inviting problems in where they were normally be none.
1. Early breeding. Females can DIE from this. They need to be kept seperate until they are of breeding age. Which is normally two-three years.
2. Disease transmission. If one is sick you can't tell who if its bad crap, and if one is sick with something transmittable you now have TWO snakes to take to the vet, although if your friend can't afford a measly 5-10 bucks for another enclosures I don't see how he can afford to take two snakes for fecals, and vet visits if one does indeed get sick.
3. Stress. snakes are SOLITARY CREATURES. They do NOT make friends, they don't miss other snakes, and they live alone almost 100% of the time in the wild. They can be stressed out (and you might not even be able to tell) by being forced to share a cage. You need DOUBLE the space as normal and four hiding spots at minimum.
I would tell your friend to stop being cheap, or don't buy more animals. And certainly do not breed if you dont have at least a few hundred dollars set aside for everything you'll need, if not more.
bmm