Hay and treats

So I've had my chinchillas since Christmas. I get on the site multiple times to get information in stuff that I need about my chinchillas. But everybody says something different. So I'm asking what kind of Timothy Hay do you recommend? What kind of treats can they or can't they have? I know that you can give them treats a couple times a week but it cannot be more than 10% of their diet. Another question I have is where do you guys buy your hay and your Apple sticks? Is it better to leave hay...

Hay and treats