I bought my first grinder, a Wilton square wheel on the company's credit card I worked for and had them take $20.. a week from my check. of course that was a long time ago and that machine was $800.00 then.
all good things come with time, like John said, with a grinder and a good drill press you can build machines.
you can either build or buy, buying being the fastest way to getting good machines that generally work out of the box. building is another story, if you have the means and confidence by all means go that route. but I think all of us have seen some Rube Goldberg machines in our day, and then there's the dangers involved with wiring, fires and things flying apart.
Then, some people are so cheap I think if they knew their time was coming they'd build their own coffin.
One thing that I've noticed is a lot of folks build their own machines and then tinker with them forever to try and get them right, that would drive me nuts and probably keep me up at night thinking of my next move to make it right... meanwhile the clock keeps ticking away.