Bill
I make all my own mounts in UK. I won't tell you the equipment because I don't know if it is available in US, but the cost was much the same as Joseph mentioned. I enjoy it and it does not take that much time. I can also get exactly the mounting I want.
As far as frames go, if the required frame is a standard size, then I buy them from a local hobby Shop (Hobbycraft) as they have a good selection at very reasonable prices. However, I make the mount to suit.
However, if the frame is an odd size (and some of mine can be very odd if they are stitched landscapes), then I make the frame myself as the cost is very very high in UK for bespoke frames, and besides, I enjoy messing about with timber in my shed for a change.
Have fun
Nigel