@flessard Welcome to the RobotShop Community! You can find the selection of CNC milling machines here:
https://www.robotshop.com/en/tabletop-milling-machines.html
The size you mention is pretty small and don’t know of any which cannot cut that size. Although some are not powerful enough for metal, end mills can normally cut through plastic like Lexan.
You really just need to determine if you want to purchase a larger machine for potential future applications, if you want a machine that can also engrave (again, future applications) etc.
If you want something robust, Sherline’s lineup is really popular (the CNC upgrade package is sold separately), for example:
https://www.robotshop.com/en/sherline-3-axis-5000-cnc-ready-tabletop-vertical-milling-machine-package-inch.html
https://www.robotshop.com/en/sherline-cnc-upgrade-kit-for-sherline-cnc-machines.html