Mining supplies vendors usually sell [Jeweler's Kits] and mining-related items.

Vendors

•  Frank Natale <Engineering & Mining Supplies> in Twilight Highlands
•  Zim Bamzabble <Engineering & Mining Supplies> in Twilight Highlands
•  Dorian Fines <Mining Supplies> in Dalaran
•  Fono <Mining Trainer> in Aldor Rise, Shattrath City
•  Hanlir <Mining Trainer> in Scryer's Tier, Shattrath City
•  Lunnix Sprocketslip <Mining Supplies> in Winterspring
•  Vernon Farcavern <Mining Supplies> in Badlands
•  Kurm Stonehoof <Mining Supplies> in Thunder Bluff
•  "Kobold" Kerik <Mining Trainer & Supplies> in Dustwallow Marsh
•  Brooke Stonebraid <Mining Supplies> in Stormwind City
•  Golnir Bouldertoe <Mining Supplies> in Ironforge
•  Gorina <Mining Supplies> in Orgrimmar
•  Herble Baubbletump <Engineering & Mining Supplies> in Duskwood
•  Lutah <Mining Supplies> in Orgrimmar
•  Merran <Mining Supplies> in The Exodar
•  Muaat <Mining Trainer> in The Exodar
•  Rissa Halding <Mining Supplies> in Darnassus
•  Sarah Killian <Mining Supplies> in Undercity
•  Teep Topup <Engineering & Mining Supplies> in Wetlands
•  Zelan <Mining Supplies> in Silvermoon City
•  Karen Taylor <Blacksmithing & Mining Supplies> in Redridge Mountains
•  Karm Ironquill <Mining Supplies> in Loch Modan

Typically sells

• [Coal] for 5
• [Jeweler's Kit] for 8
• [Mining Pick] for 81
• [Mining Sack] for 10
• [Simple Grinder] for 2 50
• [Strong Flux] for 20
• [Weak Flux] for 1