These are your thumbnails.

Assateague $35 to $45
Cape Hatteras $35 to $50
Sandy Hook $25 to $35
St. Simon $25 to $35

Full set of four-$100 to $150


Pt. Judith $25 to $35
Rose Island $25 to $35
Beavertail $25 to $35
S.E. Block $25 to $35

Full set of four-$100 to $135

The ones you listed go between $25 and $50 apiece, pending on how bad a collector needs one to complete his collection.
The Hatteras and the Assateague are the more popular ones.