Hi Marc,
I think it may not necessarily be a bad time to buy a camera
While CMOS technology has definitely made larger chips more affordable, I am yet to see deep space amateur astro images takes with CMOS that vastly surpass those taken with CCD-based camera, given that both have been skilfully processed, have equivalent exposure and were acquired with adequate telescope-mount system. Continuous technological improvements are almost a given, so I would recommend to get involved right now and have fun with the rig you have/can buy
Here is a link to a recent interesting article that in a simple way compares the two technologies:
https://www.atik-cameras.com/news/di...-cmos-sensors/