Bookcase

And in the white (pre-finish)

Design comes from The Anarchist’s Design Book at Lost Art Press.
It’s a dirt simple build, just dados and nails and glue. and you can expand it to be whatever size you need. The total cost of materials is about 17bdft of primary wood and 6 bdft of back. That worked out to $85 of maple and $32 of poplar. So just a bit more expensive than a Billy at Ikea, but it’ll last forever. Took me about 8 hours of shop time and I’m pretty slow.