Don't know about bedding- btw, this isn't for me (I'm sadly allergic to guiena pigs and rabbits).
Newspaper, then bedding/shavings, then hay, right? What bedding/shavings do you use- and is Aubiose good. On omlet, you can order for £13, 20kg of Aubiose, with excellent reviews. With delivery, Dniece would only pay £18.50/60, that seems a lot compared to cheap P@H shavings, but the 'large' woodhssvings are £9.50 for approx. 11/11.5kg, according to the website, so it should work out cheaper- unless, due to smell/absorbency, it comes off worse and needs replacing more. Yes, we are doing maths about guinea pig bedding...
So...Have any of you used Aubiose? Is it cost effective and how long did it last? If you don't, what do you use and does it work well? Outdoor guinea pigs (well- they WILL be)?