Online order

I rarely buy anything on line but recently I made a purchase and I can see why Amazon is to popular. I ordered 4 pair of women's compression socks and got them in two days with no shipping cost. They were the wrong size so I sent them back. I didn't have to pack them. I just took them to UPS and they packaged them up and there was no shipping cost. By the time I got home I got and email from Amazon saying that they were aware that my return was on the way. Now I just have to see how long it takes to get my money back.