Dire Straits - Live at BBC, Alchemy.... all Dire Straits

Chris Rea - The Road to Hell
Mike Stern - Upside Downside
Jonas Helleborg - Temporal Analogues of Paradise
Burning Water - Live and Lit
Michael Landau - Live (not Live 2000 import)
Patricia Barber - Live: A Fortnight in Paris
Eric Dolphy - Out to Lunch, Outward Bound
Frank Zappa - The Best Band You Never Heard In Your Life, Live at the Roxy
Diana Krall - Live in Paris
The Jesus Lizard - Show, Goat, Liar
GWAR - Scumdog's of the Universe
Butthole Surfers - Independent Worm Saloon
Ween - Live at Stubb's
Janes Addiction - Kettle Whistle
Charlie Hunter - Songs from the Analog Playground, Copperolis
Pink Floyd - Animals (remastered)
Little Feat - Neon Park, Waiting for Columbus (remastered)
Willie Nelson - Milkcow Blues, Teatro
Sugar - Copper Blue, Beaster, Besides
Minutemen - Double Nickels on the Dime
King Crimson - Absent Lovers (double live)
Talking Heads - Remain in Light, Stop Making Sense (remastered extended edition)
Sade - Live
Horowitz - The Complete Deutcshegramaphone Recordings
Bill Evans - Sunday at Village Vanguard
Sonny Rollins - Saxophone Collosus
Wayne Krantz - Two Drink Minimum
Karizma - Document
Ornette Coleman - Beauty is a Rare Thing: The Complete Altlantic Recordings
Miles Davis - Kind of Blue, Sketches of Spain, In a Silent Way
Wayne Marsh & Lennie Tristano - Intuition, Live at the Montmartre Club
Morphine - Buena, The Night
Steve Tibbets - Exploded View, The Fall of Us All
Various artists - Stax 50th Anniversary Collection
Charlie Parker - Yardbird Suite: The Ultimate Chalie Parker
B.B. King & Eric Clapton - Riding with the King
John Lee Hooker & Canned Heat - Hooker in Heat
Uncle Tupelo - Anodyne
Dwight Yokum - Hillbilly Deluxe
Various Artists - Death Row Greatest Hits
Cypress Hill - Black Sunday
Guns & Roses - Spaghetti Incident (their best work...doing covers

)
Rory Gallagher - Irish Tour
Robin Trower - Live: King Biscuit Flower Hour
Iggy Pop - Live: King Biscuit Flower Hour
all Cream
all Wayne Shorter
all Andrew Hill
all Debussy
all Satie
all Liszt ("most" classical recordings are dirt cheap)
anything from Fat Possum (Black Keys, R.L. Burnside, Junior Kimbrough, Paul "Wine" Jones, etc...) Fat Possum supports grassroots jukejoint delta blues style artists. Often crude, greasy lyrics, often sloppy playing but often well recorded. Music for when you should have not drank that last beer. Great driving music or if you're having problems with the old lady, kids, boss, neighbors, fellow humans, etc... and just feel like kicking the dog! Music with attitude!!!
all the Alligator Records Anniversary Collections. Alligator features Blues greats and the recording quality is usually excellent!!! ...start with the 20th Anniversary Collection.
Can have same attitude as Fat Possum, but not as frequently and usually more polished performances.
Amphetamine Reptile "Dope, Guns and ****ing in the Streets" Compilations (first try volume 4-7, then 8-11 if you like 4-7) this is where Helmet started. Music to piss the neighbors off! Though some can be quite humorous, for the most part you might as well hang a big sign around your neck saying "STFU and STAY AWAY"
Give MapleShade recordings a try...very simple soundboard recordings claiming no mixing, dubbing, etc... some can be quite raw in a bad way while others are raw in that "awesome...unrehearsed performance in your livingroom" (or head

) raw!
all ECM recordings: look for their samplers as their recordings are pricey and its artists can be quite ecclectic! Excellent recording quality!!!!!
....ditto on those who listed "Let it Bleed"! a definate desert island pick