Of course, depends on the coop, but I've seen most managing agents and coops charge around $400-$500 for application fees. Then, there's credit check (about $50-$75) and move-in/move-out fees (usually refundable if no damages). That's been the rule of thumb for my last several deals.
Fees vary from complex to complex, there are no set amounts--generally there is an application fee, credit check fee, some may want a background check fee, etc. Your agent can best advise as to the fees as they relate to each specific complex.