It’s hard to realize that Labor Day weekend — signalling the end of summer — is already here. It would be a bit depressing, except that the weekend also brings with it some really good deal. For example, you can nab a Hisense S7N 55-inch TV at Best Buy and Amazon for $699.99, a solid $300 off its usual $999.99 and only $11 higher than its all-time low. This is part of the Hisense CanvasTV series, which is designed to…