Most accurate way to gauge the market price is to go to eBay and filter for “used” and “sold items.” That way you can actually see what people paid for them. It looks like they've sold for anywhere from around $1,400 up for mint condition. I'm actually surprised they've sold for that much.
You can also check the "Buy it Now" prices, which are usually fairly accurate as well, if you disregard those at the higher end and look only at those somewhere in the middle.
Mpb (a reputable used dealer) has a number of mint bodies on eBay now for around $1,500. Makes me think people have been unloading them in anticipation of the R5. Canon Price Watch also lists used. Looks like there are more than 20 listings for used/refurbished on CPW. Prices ranging from $1,400 to $1,700.
Bear in mind that "for sale" listings only mean that's what sellers are asking. That's why I like the eBay sold listings, you know what someone actually paid.
The market may soon be flooded. Price is likely to drop.