Only for today (2/6/2023) both B&H Photo and Adorama have a 20% discount (that's $96)…
Only for today (12/17/2019) Amazon Germany has the Sigma 150-600mm F/5-6.3 DG OS HSM lens on sale at €779. Compare at €857. Free shipping.
Other lenses for Canon mount are also discounted at Amazon Germany, and only for today.
More to look at:
We offer 10% discount to subscriptions to Pixpa all-in-one platform for photographers.
Canon Europe stores have a cash back promotions going on: