You can add WJTB's, individually, to your watchlist. Then you will get email notices when they move. You have to scroll through listings of caches to see where they are first, though, then click on the name of the cache, then the name of the Jeep, then click on "watch this travel bug".
I found one yesterday and felt guilty for keeping it too long, so I snuck out of work for a few minutes to drop it in an easy cache near my job!