[Sylvain (Jon)]

You could probably grab yourself a small Mak, perhaps a 90 or 80mm.
Very compact for a telescope. But you need to think about the mount. That's when things get difficult. The scope itself can be purchased for that price, however you will need a mounting solution. And if you are aiming at looking at Jupiter with decent magnification a photo tripod is probably not going to cut it. But perhaps this is something you can live with while you travel and get the mount for home? Scopes like the Celestron C90 come with a small backpack, so easy to carry around if you already have a photo tripod (shop around the net for a good deal).
The binoculars sure are an option, but you can forget about looking at the planets and if you live in a metro area (or if you observe mainly from your backyard), binos will be disappointing. Anyway, they cannot be compared to a proper telescope. They are however great for travelling and looking at wide fields.