I am in the Puget Sound area (Washington). Early last spring, I posted an ad on Craigs List that I wanted to buy a Raleigh Twenty folder. My intent was to rebuild it. Within a couple days I received an email for a 3 speed R20 in good to very good condition, with no parts missing (it has the original everything, including rack, pedals, handlebars, fenders, etc.). The original SA3 hub was made in 2-1973, so my best guess the bike dates to spring/summer 1973. He sold it to me for $100.
I do not know what they should sell for, but $250 seems high to me.
By the way, I have since rebuilt most of it, except the bottom bracket/cranks, to include: I built up new wheels with a SA8 hub in the rear, new headset, stem, neck, front brakes (v brake), chain, pedals, tires, handlebars, etc.
Enjoy!