Monster via eBay offers its manufacturer-refurbished Monster HDP 1800 PowerCenter for $75.95 with free shipping. That's the lowest total price we could find for a refurb by $22. (It's also $117 below the best deal we could find for a new unit.) It features eight surge-protected outlets, a clean power filter to reduce electronic noise, and T2 circuitry, which disconnects the PowerCenter when unsafe power levels are detected.
Of note, no warranty information is provided.