Hi Jim,
I don't have a favourite place to buy from - in fact it is some time since I bought my last machine.
It sounds as if you are looking at buying a re-furbished one.
If you are looking at eBay then be careful who you use.
Look at their % and anything below, say, 95% I wouldn't bother.
Also check out the country of origin.
Amazon is now simply a market place.
You could set yourself up as a company and sell there.
So again, be careful if you intend buying from them.
Remember not all reviews are genuine.
Google is a great source of information.