A cheapo router as in goodwill or bargain basement, that has nas functionality, can often find a home in starange places.
be creative about using other than factory casings, and find a place to piggyback some power, you will have a dead drop.
secure the router with something hackish for a password, and even use LAN encryption. Keep doing this as often, and as wideley as possible, and when you come back to maintain the drop, and review the dropped material to scrubb out the knuckledragger porn and flaming, you can reveal a number of precious gems. it doesnt need to connect to the internet it only needs to be reliable and have storage.
you may even get enough access points to mesh them.
this should give you some ideas as well:
look for old telephone subscriber boxes or other casings that are common in the wild to put your dead drop into.
Im from the era when BBS ing was moby huge, and we would war dial all night to get a list of potential BBSs and other fun numbers that gave a modem handshake.