Apple Store offers its factory-refurbished Apple Mac Pro Intel Xeon 3.7GHz Workstation, model no. ME253LL/A, for $2,549 with free shipping. That's tied with our January mention and the lowest total price we've seen for this model. (It's also $250 under the best price we could find for a new unit.) It features an Intel Xeon E5 3.7GHz quad-core processor, 12GB RAM, 256GB flash storage, dual AMD FirePro D300 2GB video cards, 802.11ac wireless, Bluetooth 4.0, and Mac OS X 10.9 (Mavericks).

Also available is the factory-refurbished Apple Mac Pro Intel Xeon 6-Core 3.5GHz Workstation, model no. MD878LL/A, for $3,399 with free shipping. That's also tied with our January mention and the lowest total price we've seen. (It's $321 under the best price we could find for a new unit.) Compared to the model above, it features an Intel Xeon E5 3.5GHz 6-core processor, 16GB RAM, and dual AMD FirePro D500 3GB video cards. Both models carry a 1-year Apple warranty (the same as new units).