Thrive Market has some good options there. It is as close as you can get to a "market" for GF needs, I think.
Lately, I have enjoyed "tortilla chips" made by From the Ground Up.
Tate's Gluten-free cookies (not Keto friendly, though)
Rx bars are good in a pinch and easier for me to find locally.
The brand Enjoy Life is a great one and their crispy cookies are amazing!