It's way cheaper and better to make yourself.Is the beef jerky worth the time? I bought a dehydrator to make snacks since we are home all the time. I mostly make dried fruit for the kids. I intended to do more vegetables for my own snacking, but it just doesn't do it for me. I could mess with some jerky, but it seems expensive and time consuming for the yield.
Just buy a cheap shitty beef roast. A lean one like eye of round is best if you're not gonna be refrigerating it for a while because the fat makes it spoil quicker. If you're gonna just put it in the fridge and pig out on it over the next couple days, fattier is definitely tastier. Cut it into 1/8" thick flats/strips/whatever, marinate it, dehydrate it. Some people say you should freeze the roast before you slice it... just use a sharp knife and refrigerator temperature is fine.
And it's fun to fuck around with different recipes. Last night's jerky was a vietnamese-ish one I threw together with hoisin sauce, sriracha, lime juice, peanut butter and a bit of fish sauce and it came out excellent. Before that I made a massman curry one. Epic Meal Time has a cheeseburger jerky recipe on their youtube channel which I've made a bunch of times and is surprisingly good.