From Ikea (gasp) real wood shelves that fit drawer units. The real wood was over twice the price of the particle board shelves. Pyraxis talked me out of the red plastic inserts.
They're not like the old solid pine shelves from Ikea that I have in my storage box - these are made of laminated pine. Still, they smell of wood rather than glue or plastic.
Tomorrow I'll finish assembling it and also put together the chair Pyraxis bought for the living room.