T-mobile keeps on getting better.
+1 still not cheap enough unfortunately, I have an Israeli and a french sim that run me $4 and $5 per month respectively. They are unlimited international with 4g. I keep them open all year long as they are worth it even if I only travel to these destinations once in the year for Internet itself.
Yes I did try to market the Golan plans here for tourists, and no they won't let me as it would be unfair competition to all the American companies ripping off people on a daily basis. Actually the plans marketed to tourists in Israel are also more expensive than the regular plans!