They stopped making them over a year ago due to new flavors and lack of shelf space, but they tell me that they do reprise mothballed flavors on occasion. Public input can make a difference, so do join in my efforts to see my favorite chips return. Here's the link at which you can contact Tim's Cascade to weigh in on behalf of Dill Pickle Chips.
If you're wondering what dill pickle flavored chips are like, imagine a pretty tart salt and vinegar chip with the addition of garlic and dill. Perverse...but terribly addictive.