The day after Thanksgiving is the busiest shopping day of the year. But you don't have to brave the Black Friday crowds to get a good deal. Look online for special offers and take into account whether the shipping is free.
My motto is "when in doubt set up a spreadsheet". I was looking for perfume and as it's not something I purchase often I was confused with all the sizes. On the Excel sheet I noted the sizes distinguished between perfume and eau de toilette and listed sites that offered the perfume. I finally decided on Target.com as they had free shipping without a limit on spending (I chose the smallest size) and there was also a $10 discount. It worked out to be 1/3rd of the cost as advertised on other sites.