Bolt in cages might not be as strong if you ever really need to use it during a rollover. There is a price to pay and for your safety, some people will tell you there is no price tag that is too great for your life. Of course we all want to keep our cars within a reasonable dollar amount as this is suppose to be cheap racing at its best.
With that said, I think the going rate at TC is around $1,600. A brand new Autopower cage is going to cost you around $900 shipped and then you still have to spend some money to have the door bar welded on and the time to bolt everything together. By the time you are out the door, you are probably spending close to $1200-1300 so it really isn't that much of a savings.
However, if you can find a good deal on a used cage that is DOM tubing, like I did for only $400, then the price looks that much more attractive for going with a bolt in cage. Good luck in finding one as it is very hard to come by. Not only are you looking for one, Jeremy is also hunting around so if one pops up, you'd better snatch it right away. Must make sure it is DOM and not ERW tubing. Of course you will still need to buy an extra door bar from Autopower and have that welded in.