After doing quite a bit of research regarding the different feed options for chins, comparing the different brands/formulas and their ingredients, nutritional analysis, etc. I ended up deciding on Purina Rabbit Chow Show. In general I don't really advocate using a feed formulated for a different species when it comes to most animals but I feel quite comfortable that the PRCS is actually appropriate for chins, more so than many of the commercial "chinchilla pellets/foods" on the market in fact. I'm able to get it fresh and very affordably at my local feed store also. I also have access to Mazuri chinchilla pellets there but tbh I've never been a huge Mazuri fan in regards to other critters I keep/have kept in the past. I just adopted 3 new girls about a month ago who'd been on Mazuri and have successfully transitioned them to the PRCS also and very quickly noticed an improvement in the color, consistency, and size of their stools.