If you put the brakes on a big avionics upgrade because of the eye-watering price and lead time, you likely considered used equipment. In normal times that might not be a bad plan, but the market isn’t exactly what I consider normal.
Have prices of pre-owned electronics skyrocketed as they have for aircraft? You bet they have, and so has demand. Part of that is the result of a choked supply chain of components and shop labor. That has changed the landscape for buying late-model and even aging avionics, where waiting lists are growing and prices are more inflated than they should be.