Cheapest priced copy (Champions of Kamigawa): $0.35 at Card Kingdom, near mint, their price list as of .
Akki Rockspeaker 
Creature — Goblin Shaman · 1/1 · Common · Champions of Kamigawa · #154
When this creature enters, add {R}.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Champions of Kamigawa | 154 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 25 January 2011You get the mana whether you want it or not. If you don't spend it, it will disappear at the end of the current step (or phase).
- 25 January 2011The triggered ability isn't a mana ability. It uses the stack and can be responded to.