There are some copies of the Lo-Pro Edge
now so you do need to be careful. They do look similar so you have to look out for the small differences. And yeah if the price seems too good to be true, it's probably a fake.
You can pick up Edges and Lo-Pros for good prices on the Bay if you are patient. I got my Edge from assbass (on this forum too) for around USD$50.00 and it was in pretty good condition.