If you are looking to buy a boring machine, they are available at times. I was looking for one, and emailing with a fellow in Calf. who wanted $240 for his. I've seen them, in excellent shape, sell for $500. I got mine for $50, and a tool dealer had one, same as mine, but worse shape for $85. They are out there but you have to look around. You could try myoldtools.com, in Texas, he has been know to have bits for sale for these, and I don't know if he has boring machines or not. The other choices are a chain mortiser or a chisel mortiser. These are expensive machines but work very well and get the job done quickly. If you get one, and need some bits, the guy who I got my bits from had some more for sale, back then. I'd have to check with him to see if they are still available, if you wanted them. Good Luck. Jim