I have to get a new printer and would like to know if a colour laser is worth getting?

We have a small home office. I think we print about 500 black and white pages per month. We do not use colour much, wonder if it will ever get to 100 pages per month.

Inkjets don't work for us because the ink dries before we can use it all.

Does a colour laser's ink also dry out?
How expensive are their cartridges?

Currently only use a mono laser which is super cost effective and we have the colours printed at a local printing shop.