@tebasile27 I like Mary's Crackers. They are not cheap though, but very crunchy and flavourful and satisfying. There are a lot of seeds involved though, in case you have any allergies. Here's a link about them. You can order them online too (free shipping over $59 and 10% off next order)
marysgonecrackers.com/
I can find them in my regular grocery store but I'm pretty certain you can get them also at any Whole Foods or other health type store too, if you don't need to order online.

Mary's Gone Crackers can now be found at Costco. I bought 6 huge boxes when they were on sale for $5!! yay. Now the 26 ounce box is $8. STILL a good price.

Other wise, when I have time - I bake my own flax crackers. Easy.
Here's how I make them...

-Preheat oven to 375
-Grind flax seeds in blender to get a meal. ♪ I will also add in onion powder, garlic powder, ground chipotle peppers, other spices or Parmesan cheese to change flavors.
-Mix with water until a dough you can spread.
-Line a cookie sheet with parchment.
-Spread out dough as evenly as you can. ♪ make it slightly thicker on all the edges, since they will dry out & cook faster. But with thicker edges, you can get a more even bake.
-Score the dough with a knife. ♪ this will allow you to break the crackers into squares after they cool.
-Bake 20 - 25 minutes. Or until it reaches your preferred doneness.
♪ HOWEVER - not all ovens are created equal. Watch your first batch and time it.

They're not super high in fiber, but I love Simple Mills Fine Ground Sea Salt Almond Flour Crackers. They're so good!