Amazon has increased the minimum price of an order that qualifies for free shipping from $35 to $49, unless you're buying more than $25 worth of books. The last time that the cost went up was the back end of 2013, when it was bumped by $10 from $25 to $35. Of course, shipping is free if you opt to pay $99 a year for Prime, which has whip-fast shipping as well as musicand video streaming. As well as pushing people toward the paid service,TechCrunch points out that Amazon has b