I have a Brightdrop. I had replied privately, but for the rest of the group:
There are quite a variety of Brightdrop configurations, so there are a wide variety of prices. There's 20' or 24', small or large battery, RWD or AWD, power doors or no, power offboarding or no, etc.
The first two years ('23 and '24) it was sold as a Brightdrop Zevo. For 25 and 26 it was sold as a Chevy Brightdrop. Theoretically there is no difference, but practically there can be issues with registration, warranty, insurance, etc if you have a Zevo. They can be worked through (and it's getting better), but it can bring some aggravation. The older ones are also more likely to have leaks. Of course, they tend to be cheaper so it may be well worth it.
Then of course there's whether it's used or new, if used then miles and condition.
I haven't following current pricing very closely since I already have one, but from what I can recall a used '23 400 with RWD and small battery may well go for mid-thirties (it could be less, of course, but I don't recall seeing it). But a new '26 600 with AWD, large battery and power offboarding may be more like $50k (if you can find one at all; they were rare and have been very popular). These numbers are of course very rough, as there are only a small number of buyers and sellers to it depends as much on individual circumstances as market forces. The fact that they aren't building any more can apply both upward and downward pressure; the numbers are fluctuating. It's very hard to say what a "fair" price is.
As for mine...well, I bought it converted, so the price of the van was hidden as it was bundled with the conversion costs.
There are several owners talking about what they paid and documenting their own DIY and paid conversions at
brightdropforum.com.