1. If you are planning on starting a sharpening business with it, you don't want a cheap grinder. You want something you can rely on for good results.
2. Cheap grinders come with cheap wheels, which are the most important part: it would be like running cr*p chain on a good saw, or cheap tires in a nice car.
Best deal on the Internet, IMO, for a basic, quality grinder:
https://www.ebay.com/itm/Tecomec-Co...681932?hash=item593e15710c:g:nu0AAOSwySFZfiXE
Good quality with good quality, Italian wheels, for about the price of buying a clone grinder and replacing the wheels.
Lacks the 'down angle' feature and built-in light if those are important to you. If so, go up a model from the same seller (US importer).
Philbert