Sigma introduced new instant rebates on the US where you can save up to $500 on Sigma Art lenses. Here is the list of discounted lenses:
35mm F1.4 Art DG HSM Lens
70mm F2.8 Art DG Macro Lens
10-20mm F3.5 EX DC HSM Lens
17-50mm F2.8 EX DC OS HSM Lens
17-70mm F2.8-4 Contemporary DC Macro OS HSM Lens
18-300mm F3.5-6.3 Contemporary DC Macro OS HSM Lens
100-400mm F5-6.3 Contemporary DG OS HSM Lens
150-600mm F5-6.3 Sports DG OS HSM Lens
150-600mm F5-6.3 Contemporary DG OS HSM Lens
105mm F2.8 EX DG OS HSM Macro Lens
F1.4 Contemporary DC DN Lens
120-300mm F2.8 Sports DG APO OS HSM Lens + FREE Teleconverter
EF 630 Flash