Been crownland camping the last 8 yrs.

Your route takes you right by Sandpoint Lodge, 1 bay to the north of the customs you just mentioned on Sandpoint.  They'll sell you the permits...$9-10/ night.  Camp anywhere you like.  Sandpoint lodge will also snailmail you the permits, or even drop them off at any business on Crane for you.  They're open year round and can also sell you fishing licenses.  Can't miss their place, on point on N side of bay.  Can see them on Google Earth as well and you can Google their web page for more info.

Bring your outdoor card, you can skip customs 1 bay to the south if you have a valid RABC