I have a Midway catalog from 2014 which lists a Benjamin CO2 .22
as well as .17 & .22 pumpers with WOOD grips. They did not have a model#. Midway says that they don't carry them anymore. Does anybody know if these are still available, and if so, where?

Try here.

http://www.airgunsofarizona.com/Benjamin.html

Wood grips? I have a Benjamin M137 that is 30 years old that has plastic grips. They are pretty simple, I'd bet any decent grip maker could build a set pretty easily. That link above looks like they change the gun a bit from my old one.