You may want to check out REI or Nashbar, they may have some inexpensive, non waterproof ones.
Always take into account any cross border fees--generally there is a $10 handling fee (no matter the purchase) and then the two taxes, prov and fed., plus of course the dollar diff---so add this all up to see if its worth it for you.

it can be tricky too obviously not seeing a product in hand, to see how the stitching is, the size, how the mounting system quality is.

Good luck, I used non waterproof fronts for years, put my cooking stuff in one and rain gear in the other, so it was ok not being waterproof. Have used waterproof rears for a long time though.

all the best finding something at a good price.