It seldom gets any cheaper than voip.ms. For Israel, it seems to be $4.75/mo for a national number and $9.00/mo for a geographic number. (Setup fee equal to one month's billing.) This includes unlimited inbound calls. To forward the call back out to a US number costs $0.01/minute. Pretty powerful and reliable... I've used them for years, and have 10+ numbers active at any given time.

Another alternative is to get an Israeli SIM, and forward your US number to that. The Verizon extortion rate is $1.49/minute, but you can reduce that per-minute rate to $0.15 by enabling a $5/month feature, or go unlimited for $15/month. (Unlimited Together North America, or Unlimited Together World, respectively.) https://www.verizonwireless.com/solu...country=israel

Before you go through too much trouble... how do your Israeli contacts currently reach you? If they are used to reaching you at a certain number, getting a new one - while local - may not actually make things easier for a short 3 week trip.