IndieRoyale has released the Prairie Dog bundle, which includes Retrovirus, Signal Ops, Zack Zero, Vox and Sol Survivor. All games are available on PC through Desura, with a few Steam keys available. As ever, you pay what you want above a minimum price, which rises when users pay the minimum and lowers after more generous purchasers pass through. At time of writing, the five games are going for just over $6. Get on board on IndieRoyale.