I say you need to get a kennel. You said you can't afford it right now so you will HAVE to compromise. You see, allowing the dog to do that will only intensify the problem. You are allowing the dog to create a bad habit and when it gets bored or lonely it resorts to its way of having fun. Problems like have many solutions but I do what I know works. Confine him when you leave. He has no choice but to sit there and deal with it. Period. You say you can't afford a kennel. Well, Do like I do when I used to leave. Get about 4-5 cinder blocks from Lowe's, Hoem Depot or whatever. Stack them up. Go to walmart and get the heavy duty tie-down for dogs to hang outside on which connects to the post that goes in the dirt. Wrap the tie down cord (get the heavy duty ones, not the red ones, it should be clear) through the holes of the cinder blocks. Leave enough cable( it is actually a cable with a plastic sheath) like appx 6-8 ft. It is more room than a kennel and he won't fell like he is in one. Put that in the kitchen against a wall and make sure he won't go under the table or anything and get it all tangled up or else there will be a disaster when you get back. Put a rug down for it to lay on. Blankets tend to get caught up and wrapped around the cable. I used to have my kennel divided and put on inside the other. I put the blankets in there and at the end of the cable was the little bed. Do that and it will forget about the bad habits with new better habits that aren't so destructive. Or confine it to the bathroom. Put the board against the door way. Have supports on the board so you can "lock" the board in place to prevent pushing it over or squeezing through the sides. Put a blanket in there and some toys. Get a cattle bone that is RAW. Raw bones do not splinter. Only tiny pieces come of from chewing and are fine if swallowed. This is for tension. The intense chewing will elieviate stress better than rubber other toys. I on;y use hard rubber balls or king kongs for play and nothing else. These won't get torn up easiely and will provide years of enjoyment. If he doesn't like them then make him like them. When you tell him to sit or ? then get REALLY EXCITED and give him that. After a while he'll enjoy that old thing. They will become the best buddies and will look forward to getting it. Just like police dogs. They only give a simple cheap toy for the treat when something is done well for what ever job it was taught. That's all you need. Then that'll save money on outrageous treat prices. Also if you must use food then most people don't think of this but use the dog food. Each kernel is a treat and now you have thousands of them.
I posted an example for you to show you what I mean about the bathroom barrier setup. This should be all you need. Then you created your own kennel that is alot larger than a kennel.
The chain is pretty explanitory with the cinder blocks. The chain setup and the bathroom-barrier will both cost less than $20-$25. So that should be efficient enough.
Also, like Tasha said, check the papers for kennels. They usually have them available from time to time. Also check the net....
Look.......
For $30.....
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2353310375&category=20745
for $15....
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2353336613&category=20745
Here is the link so you can do the rest of the looking.....You can find one if you really look around.....You have to do your homework....
http://search.ebay.com/ws/search/GetResult?sokeywordredirect=1&ht=1&sosortproperty=1&satitle=dog kennel&from=R8&sorecordstoskip=0
Anymore questions just ask......
