I don't think the GPAA (Yes I am a member) Has any land (no claiming ground in Iowa) in Iowa to prospect on but they do have a lot in many other sates. Besides Alaska there is California, Arizona, Nevada, the Black hills of the Dakotas and many others. Even property on the east coast. I don't have my claims guide handy or I could tell you more. I believe they still do a $67.50 yearly membership for first timers and that includes a good gold pan instructional video ballcap mining guide and some other stuff.
It is also a family membership so you only pay one fee and your whole family can go. You can even bring guests but they are limited in gear types.
On the other hand you will pay a minimum of $20 each per day of panning at Crow Creek Mine (kids and seniors discount as well as military and GPAA member discount). There are some free public lands but they have been hit hard for the most part.
So you only pay the $67.50 once for a full years membership. After that the price drops just for the optional renewal but no gold pan etc.
There is no renewal obligation.
There are other membership options such as a lifetime membership or a membership in the LDMA a sister organization with campgrounds and mining which is more expensive but I believe you own it and I believe can sell it.
Anyway you be the judge if it is worth it to pay to use our clubs claims.
Once you can use the PM feature send me one on where you plan to go and I can tell you if we have claims in the area.