Amazon offers La Brea: Season 3 [Blu-ray] for  (reg. $24.98) free shipping with Amazon Prime. 

Product Description: 
The end of an era begins as the survivors stranded in the past fight for one last chance to return home in Season Three. After delving deeper into the mysteries of the primeval world, the Harris family must race against time to find Eve. The stakes are higher than ever as they face the most dangerous prehistoric creatures yet -- with one shot to reunite and get back to the world they once knew.