HOA fees always always vary from complex to complex. If you don't have an agent consider the services, he/she can advise as to HOA fees as they relate to each complex, schedule showings, etc., or if you happen to know who management is for any complex, you can call them directly and ask.
They will vary from Association to Association. Other than a lot of leg work, there's probably not a lot of options on how to get the fees for each one. If you aren't up for doing the work yourself, I'd look at finding a real estate agent in the area who is willing to work with you and track down the information that you need.