Welcome to the Carver Site from a fellow GenX er!
My advice for shopping for Carver gear (or any used audio gear ). I've done a lot of this... I have what we call on this site: "OCCD" Obsessive Carver Collecting Disorder.
-Get familiar with current prices on ebay/US audiomart, etc.... all the bigger resale sites. There is some variability, but you can get a sense for what a Carver unit will go for. Make sure to differentiate from units that are being sold as "parts only", or "turns on/working", or "refurbished". And, don't forget to include shipping costs. At the end of the day, what can look like a deal turns out to be something that may need lots of work, or maybe has an excessive shipping cost.
-Get familiar with refurbishment costs (unless you plan to DIY). As many have mentioned, Nelion is a great place to have your gear refurbished, but that will add to your investment.
-Then, if you can be patient, look for person to person local deals, FB marketplace, Craigslist, Garage/Estate sales, thrift stores, etc. I have bought almost all of my gear locally, over time. The advantages: No shipping cost, you can physically try out the gear, touch it/see it, before buying. And, for whatever reason, people who sell locally seem more inclined to lower prices- vs those who are "flipping" units on ebay for example.
-Lastly, watch this site for gear sales or even "Karma" opportunities. (Some members will actually give away gear here on this site from time to time). The people on this site will not steer you wrong or take advantage of you and most on this site have the technical expertise to tell you exactly how well the unit is functioning, what's been done to it, etc.
Good luck!