Looks like you should be able to order from Best Buy's website, or their ebay store: http://www.ebay.com/itm/3DR-Propellers-for-3DR-Solo-Drones-2-Pack-Black-/321781057455?pt=LH_DefaultDomain_0&hash=item4aeba547af
The initial store I selected showed as unavailable, but once I selected another store, I was then able to select the original store. Frustrating experience for sure...