Not all Black Friday gross sales supply equally good offers — and a brand new evaluation illustrates simply how true that’s this 12 months. WalletHub discovered that the common low cost supplied by main retailers ranges from as little as 17% to as a lot as 59%. The evaluation is predicated on a assessment of greater than 3,500 offers from the Black Friday adverts of 13 of the most important U.S. retailers. Amongst all of the retailers included…