I am looking for an affiliate network to launch my first digital product, but I don't know who. Clickbank is the best, but is very expensive. I heard about paygear. THey dont charge anything and is even willing to offer me $500 to launch my product with them as a vendor.

How do they compare to clickbank, paydotcom etc? THanks

I would go with Clickbank myself only because there are so many more affiliates with them that will likely help you sell your product.