eBay top rated seller Electronics Valley has a very hot deal on Sigma 17-50mm f/2.8 lens.
New Sigma 17-50mm f/2.8 EX DC OS HSM lens for Canon EF mount – $269.00 – w/ coupon code C15LIMITEDTIME – $254.00 – at Electronics Valley via eBay.com
Note, the coupon code C15LIMITEDTIME is valid for today only until 5pm PST.
Regular price for this lens is $419 at most US stores.