Although there isn't much of a choice for shopping at the airport, there is a great selection of shops in downtown St Petersburg, so you can buy all your last minute purchases there. For the best shopping try the  Bay Walk shopping mall which is on 151 2nd Avenue North.  This is an open air complex and one of the more prestigious shopping venues in the area. 

Below is what is available at St Petersburg Airport:

Flight Shops: Selling aviation books on the ground floor, outer concourse.

Gift shop and newspaper stand:  Here you can buy your newspapers, magazines and books for your journey along with local gifts. First floor next to Gates 2 to 6

Souvenirs are also available from the Tampa Bay  Area from the Suncoast Attractions Store.

Duty free shop.  All your duty and tax free goods.

All opening times are convenient for arriving and departing aircraft.