[dredmorbius]

Outside a handful of providers (Amazon, Barn & Noble's Nook, possibly Kobo), e-ink devices tend to not be subsidised.

You can look at pricing for, e.g., Onyx's product line to get a good sense of what the cost of a given mass-market device at a given e-ink size (and capabilities, e.g., Wacom, frontlight, touch interface) are.

Smaller e-ink devices are quite affordable. At 10" and above, you start seeing a pretty significant price premium, though IMO the benefits are worth it.

(I own a 13" Onyx device, for three years now.)