New puppies wont stop chewing?

I just picked up 2 8 week old border collie pups and they are chewing on everything! I have bought chew toys for them, I have bought that spray thats supposed to deter them from chewing and they actually liked the taste of it from the moment they encountered it! I dont have a crate big enough for the both of them so I have been locking them up in the bathroom at night only to find that they have picked a spot out on the wall and have started tearing into the sheet rock on the wall. Nothing I have done this far seems to deter them from chewing. When I am home and can see them starting to chew on stuff I tell them no and they stop. I leave all their toys in the bathroom with them when they go in at night but they still want to only chew on the wall. Is there any recommendations? I know crating is the best way to go, but I dont have the money to buy a crate big enough to house both or two crates one for each dog. I am going to end up building a pen outside for them and making them stay outside at night if they dont stop tearing up my house at night. Any suggestions? Thanks :)