List of Magazines:
Magazines are where completists eventually face their doom. This list is by no means complete.
If I, or one of my co-conspirators, do not own the issue it probably is not listed. Please let me know what I'm missing and your selling price. Foreign language magazines are not included.

Adventurer: 1, 4, 7, 9, 11
Alarums & Excursions: 46, 48, 54, 56, 61, 65 (incomplete list)
Book of Drastic Resolutions: 1-3
Breakout: 34
Codex: 1-3
Dark Realm: 1, 3
Different  Worlds: 1-19, 21, 22, 24, 26-33, 35-38, 40, 41, 43-46
Dragon: 51, 129, 132, 144, 172, 206*
Dragon Lords: 13
Dungeoneer: 10-12, 14, 15, 17
The Dungeoneer's Journal: 23, 25
Enclosure: 1-2*
Fantasy Chronicles: 3-9
Gorp: 2
Gryphon: 1, 2
Heroes:  Vol. 1, #1-8 and Vol. 2, #1-4
Miser's Hoard: 3
Multiverse: 4-5
New Lolon Gospel: Vol. I & II*
Pavic Tales: 1-9
Pegasus: 2-4, 8
Read Pheasant Throughout: 1-2
RuneQuest Adventures: 1-6
RuneRiter: 1-4
Spacegamer: 85, and Vol. 2, #2
Tales of the Reaching Moon: 1-20
Tortured Souls: 3, 4, 6, 8
Tradetalk: 1-12*
Unspoken Word: 1-2
Valkyrie:  5-8
ViP of Gaming: 4-5
Wargaming: 3
The Wild Hunt: 38-48, 50, 52, 53, 55, 57, 156, 162* (list incomplete)
White Dwarf: 17, 19, 29-65, 67, 69, 71, 74, 75, 85, 88, 90, 92, 94, 96, 98, 101*
White Wolf: 15, 16, 18, 20, 22, 41
Wyrm's Claw: 16
Wyrm's Footnotes: 1-14

Currently still in business, although several of these publishers, like White Dwarf, will probably never publish RQ related material again.