Check out some of the Surefire kits on ebay. I got one for $100 that has red,blue, yellow, infrared, and diffuser lenses. They are older incandescent military issue but still top quality. If you watch for them they go cheaper than this;
https://www.ebay.com/itm/Surefire-M962-Combat-Weapon-light-kit/142636608712?hash=item2135cdecc8:g:2nMAAOSw8b1aGsnX
https://www.ebay.com/itm/SUREEFIRE-FLASH-light-KIT-FM13-FM14-FM15-FM16-FM17-FILTER-LAMP/272544969037?hash=item3f74f2314d:g:HCUAAOSw9GhYlPCX