Sorry Sandra, I meant to get back to you and hadn't gotten around to it yet. I like the Natural Balance rolls too, and you can get them at Petco and similar stores. The NB website might have a list of retailers if you can't find them. You do need to refrigerate it, but if I'm feeling lazy I just toss my whole treat bag in the fridge when I'm done. I use a quart sized ziplok bag with the top cut off as a liner for my bag (fits perfectly!) when I'm using anything the slightest bit gunky (cheese, hot dogs) or that needs refrigeration, so I can also just pull the liner bag out and put it in the fridge. I slice the roll thin, stack the slices, and cut into tiny cubes. You can cut up a whole roll if you want and store it in the freezer.
I've used freeze dried liver (usual pieces are way big, I cut down into 1/4" pieces), Solid Gold and other good quality brands of jerky treats, which I also cut into much smaller pieces, Zuke's Mini Naturals (another good choice for when I'm lazy because the pieces are the perfect size already), Plato salmon treats, Yummy Chummies, and I found some awesome salmon jerky at Costco that they haven't had since. I was able to order a couple bags directly from the company, but they haven't responded to my last email.
My dogs love crunchy Liver Biscotti, but the pieces are too big to use for training, I use them for nail trims. And we use biscuits for when we leave and the dogs go into their pen in the garage, or just because we feel like it. We use Wellness brand and Wet Noses mostly.