My own nostalgia toy is an Apple Powerbook G3 "Pismo" purchased for $30 on eBay last year. I had to swap out the optical drive, the batteries (both main and PRAM) were fried and bottom casing was cracked, but everything else worked. Boots into Mac OS 9.2.1 or 10.4.11. I use it mainly to play old school games like A-10 Attack!, SimCity 2000, etc.
For me it was I laptop I wished I had back in HS, but at $2500 (starting) brand new never happened. To finally obtain a running one 16 years later (for 1.2% of original price) was very cool for me.