Here's a download code dump. I've been sitting on some of these for a long time, so some of them may be expired by now. Also the new Alex G is there too.
Björk - Vespertine
URL: dropcards.com/vespertine
Code: QXRN4Y9CT4
Bon Iver - For Emma, Forever Ago
URL: download.jagjaguwar.com
Code: JAG115.62DJRJTP
Bon Iver - Bon Iver, Bon Iver
URL: download.jagjaguwar.com
Code: JAG135.25RDDYUA
Bon Iver - 22, A Million
URL: download.jagjaguwar.com
Code: JAG300.8FYWBPD
Car Seat Headrest - Teens of Style
URL: matadorrecords.com/mp3promotion.php
UPC: 744861108818
Code: CAR8EXZ2RXV
Death Grips - The Powers That B
URL: umgmusic.com/deathgrips
Code: v4hDfVGM
Godspeed You! Black Emperor - 'Allelujah! Don't Bend! Ascend!
URL: cstrecords.com/DL081
Code: CL-0808-000178-1761-3524
MGMT - MGMT
URL: whoismgmt.com/mgmtvinyl
Code: KKQCPNXKY3VDPF5
Panda Bear - Tomboy
URL: dropcards.com/tomboy
Code: 99QK6349HY
Pink Floyd - Wish You Were Here
URL: pinkfloyd.com/bonus
Code: P5V8355WB
Radiohead - Amnesiac
URL: wasteheadquarters.com/code
Code: QEFUGASY
(Sandy) Alex G - Rocket
URL: dominorecordco.com/claim
Code: K4ERHDHL
Vampire Weekend - Modern Vampires of the City
URL: beggarsgroupusa.com/promo
UPC: 634904055615
Code: CITYPWXK3M6N