By Kirk Miller Best Buy’s best deals over this holiday weekend involve appliances. Lots and lots of appliances. While fall is usually the best time to buy ovens, refrigerators, washers, dryers and the like (that’s when manufacturers are introducing new models and need to clear up space), the commerce giant has put together some interesting appliance deals for Fourth of July weekend that could get you to upgrade your kitchen and home a little earlier than usual. To start, you can grab a free $100 Best Buy e-gift card with a “qualifying appliance package totaling $1,499 or more.” That deal lasts…