Sigma 70-300 f4-5.6 APO DG for $120 (Sig) or $150 (C)

The Sigma 70-300mm f4-5.6 APO DG Macro goes for $150 with 4% promotional rewards at Adorama in the Canon mount. Meanwhile the Sigma mount version goes for $120 with free shipping for those with Sigma DSLRs.