Newegg offers the refurbished SteelSeries Zboard StarCraft II Gaming Keyboard, model no. 64090, for $19.99 with free shipping. That's $43 under the lowest total price we could find for a new unit, although we saw a refurb (with rebate hassles) for $5 less last fall. This USB wired keyboard features 1-touch macros, three race-specific macro layouts for Terran, Protoss, and Zerg, and anti-ghosting.
A 1-year warranty applies, although it's unclear who provides it.