first of all they were all sold to one buyer off the forums. however you can buy them on ebay so to answer some questions.
Will this work for under 25?
the cdp on these particular ones do not waive the underage fee but depending on the location you can use a different cdp
Do they have a cdp# on them
yes
do you know if its any good in israel
dont remember. i know they can be used internationally but have different rules. check ebay to read the T&C
do i have to pay taxes or fees?
will it work from airports?
you still have to pay taxes and fees. but tax on 0$ is 0$. but there will be fees. a 1 day rental at jfk (it works at airports and in nyc) costs about 2$