I have four 400's that are completely restored, and have THE ORIGINAL Atari made 48k ram board in them, NO POWER SUPPLY! you can get one from Bruce at
B & C Computervisions, or Brad at Best Electronics.
I have two with custom dust covers and they are $100 each + Shipping From Portland, Oregon
I have two with no dust Covers and they are $80 each.
If you want one With a Dust cover and Sdrive2 they are $170.
One with an Sdrive2 and no dust cover is $150.
The 400's really benefit from the Sdrive2, as most everything runs off it ( as opposed to a multicart or SIO to SD )
I only have ONE empty 48k ram card box.
If you need some of my references, visit Eightbitfix.com
PM me if interested.
Thanks for looking!