I'm planning on a trip shortly to Israel. I checked out GPS rentals and they're around $15/day. It turns out that Garmin has maps for Israel and it costs $99. Doesn't work on all models. You have to check. It's cheaper for me to by the maps and keep them. A couple years ago this was not available. Just wanted to let the folks know.
P.S. Obviously I haven't tried it yet. I'll give a report when I return