My old account book from Downing days. Fiscal rectitude was drummed into me by the folks, and I kept (almost) comprehensive accounts up to the Christmas of my second undergraduate year. Weekly expenditure seems to have fluctuated somewhat: £231 in w/b 18th March 1999 down to £6.76 for October 18th-24th 1999 (though mostly around £70 p/w). Wonderful to see how I was sustained by gifts from Grandma and Auntie Celia, complaint to the railways that netted me various vouchers, and the odd psychology experiment.
I was quite pleased with owning several credit cards and being generally a liberal sort of chap, so there are numerous receipts from the Eraina Taverna and the Ghandi for hundreds of pounds, which I used to pay on behalf of whatever party I was with, and then recoup. If I'd have been smart I'd have charged a fee for that service of course!!
A Star Wars game in an envelope. I designed and made some sort of board game (back in 1996?) based on those rather fun novels by Timothy Zahn that are set in the years after Return of the Jedi. Some of the biro artwork is quite neat, though I say so myself, but I think it's value as a game is probably rather limited!