OK.here's the poop (from a groomer)
Anything called a "pet" clipper is junk. If you are SERIOUS, go with Oster or Andis PROFESSIONAL animal clippers. YES< they will be quite a bit more that you quoted. $100 is the cheapest WE can get them wholesale. Do NOT get a cordless, unless you want to do half a dog and then wait until tomorrow.

How else can I be of help?