Get your taxes done using TurboTax

Are you kidding?  Google will take money from anyone.  You think Google contacted Turbotax and asked their permission?

There is no public official list of authorized resellers and I don't know why.  But I have reported this seller before.  And any reseller that sells for less than Costco should be immediately suspect because Costco sells below wholesale cost (because they make their operating profit on membership fees.)