If you’re a regular shopper on Amazon and want the shopping benefits of Prime, it makes more sense to go with the full-year plan instead of the month-to-month option. Yes, you’ve got to pay $99 all at once for that membership, but that ends up significantly less expensive than the $131.88 you’d spend over the course of the year. Depending on what you buy, and how quickly you need it, you may want to consider ditching Prime altogether. Amazon recently made it more difficult for non-Prime members to qualify for free shipping, raising the minimum order to qualify for free...