Is there anywhere in Westport or Castlebar that sells plain popcorn kernels?

Because of a new illness I've become allergic to almost all foods. I've been dealing with it for 8 months now and my diet is very restricted.

But I read that I should be able to eat fresh popcorn with a bit of salt and that would be a huge win for me. The only problem is that I can't find it anywhere. If anyone can point me in the right direction I would be very grateful, thanks