I got Grace (Jeff Buckley) technically for free about three years ago

.
Someone had heavily recommended getting My Iron Lung EP. so I went along to Virgin/HMV where it was a 'buy two get one free' deal or something similar. Spotted Everclear's 'So Much For The Afterglow' and then looked along the rack for the third...
The rest is musical joy

. So probably the best musical bargain, although that would diminish the awesome role of Groucho's/Fopp. The most memorable, anyhow.
BTW, Dan, I'm really digging the MP3s on the site.