An I-opener modified with a faster CPU is hard to beat.
With a laptop from e-bay with cosmetic case damage, unscrewing the hinges, bending the screen all the way back so it lays flat on the bottom of the case makes something similar to an I-opener. Most will be missing the power supply and batteries. Any regulated 12V supply usually works.
I did this with a DX4-100. Stuck it inside a box an mounted a picture frame on the front. It's too slow for most things; but works great as a digital picture frame.
Finding a "parts" laptop matching the I-Opener's price and performance is difficult.