Today Only – Graco Highback TurboBooster Car Seat For Just $28.99! Posted on April 26, 2015 by Jeri Today only, Amazon has the the Graco Highback TurboBooster Car Seat on sale at just $28.99! This one-day offer is valid on April 26, 2015, or while supplies last. Click here for this deal. Share the love: