There are many stores selling Gucci Sunglasses online and will have discounts from time to time,not only in the winter .you can subscribe their new-settler and get the lastest information if they have a discount . But make sure to choose a reliable site since many stores sell replicas .
It is true that Gucci is of great price, because of their amazing brand and long history in the industry. And it is true that their prices would be lower in winder because of economical laws, demand and supply huh? If you really want some cheap stuff, I recommend Amazon to you, which is a nice place for designer sunglasses at an affordable price. Here is a link
I think you can find some chances to get a pair of cheaper sunglasses. This is the official website of Gucci. http://www.gucci.com/us/home Usually many online eyeglasses stores will hold some anniversary or activities on important festivals. I think Gucci will do that too. So you can place an order online when they give discounts. Hope this helped!
I think Gucci sunglasses will be cheaper than in any other seasons. Usually eyeglasses stores will give discounts in summer to attract customers as well as broadcast their new products. But the prices of sunglasses are also very high because many people need sunglasses at that time. However, people don't need sunglasses in winter. Eyeglasses stores will have less customers. So they will give discounts to attract customers and earn some money to make their ends meet.
Gucci have many kinds of products. The stores can make big profit even in winter becasue they can sell other kind of products. They won't give discounts as frequently as other online eyeglasses stores do. I think maybe you can come across discounts in its anniversary days. Good luck!