Stopped in at Wal*mart a couple weeks ago and in the CLOSEOUT room they had...
http://www.tp-link.us/products/details/?categoryid=218&model=TL-MR3020
Mine is white, may be a different model, 34 dollars.
Looked like a possible backup for what I use now.. and so it is works great. A friend is using it..
This MIGHT do the job.
Page 2:
I think it is GE (might be Motorola) makes a device where you plug it into a power outlet, plug a Cat-5 into it at one end
Plug another (The mate) into anothe routlet and cat-5 again, to your own private router.. If the home could see their way to do this (if you paid for it) Problem is they may have to shop for a same leg outlet to get it to work
problem 2 is I really do not like those devices
But the TP-link is doing well
it has 3 modes.
Mode one: 3g4G plug in a USB Wireless internet Dongle and it will work like a CradlePoint router (Many threads around here on that)
Mode two, Hook to a computer using Ethernet, log into it's browser page (192 168 0 1) (I left the dots out) and set it up.. NOTE> this was not as easy as I expected but I got it to work. Now you can connect via that same cat cable, or via Wi-Fi to it
Mode 3: Access point
Run a Cat 5 or Cat 6 Ethernet cable back to the home's router and this thin will let you access the router via Wi-Fi.. (Best mode if home will agree)
NOTE: you can use two of them with a run of Cat-5 as a long range repeater
The unit has a battery but uses a common 5 volt USB charger.