Refurbished Sigma 300mm f2.8 EX DG APO for $2280 (Sony A)

From a $100 prime we go to a $2280, the manufacturer refurbished Sigma 300mm f/2.8 EX DG APO Lens in the Sony Alpha DSLR mount is offered at this price with free shipping and warranty at Adorama.

In new condition, this lens goes for $3400 in the mounts it is currently offered on.