Just picked up the Password travel tin at B&N, and I strongly recommend getting one. It is the full 5th Edition in a smaller, metal box - scoring wheel and all. Giant score pad, too - I think it's about 100 pages. And while the box is compact, it's still big enough to hold 4 editions' worth of cards, and two Lightning Round decks (though I can't seem to quite get the sand timer in there.)
And just for comparison's sake, I still have the 25th Edition I got in grade school, around 1988. It was $6.99. This is three bucks more, twenty years later.
Oh, and for those with an interest in such matters, it reads in bold, right in the front of the instruction sheet: "Cards in the 5th Edition are numbered 87-111 (A&B)." The cards are also perforated, in sheets of five.