Ang santol talaga mahirap hanapin pag out of season, pero kung willing ka mag-drive around, try mo ang major wet markets like Quinta, Farmer's Market sa Cubao, or Dangwa, karamihan may suppliers pa rin kahit konti lang ang stock and mahal na slightly. One of my mum friends swears na ang Puregold at SM supermarkets ay may santol din year-round, though limited, so worth checking din kung may malapit sa inyo! Pero honestly kung gusto mo talaga at gutom na gutom ka ng santol, better during May-July kasi yun talaga ang peak season and mas affordable pa. Good luck sa hunt mo!