I guess it depends on how much you want to spend, but diy options are the cheapest. You can buy pine or poplar boards and drill a couple holes in them, then use bolts to attach it to the cage. I've also seen people use strips of plexiglass covered with fleece (yes chins can chew through plexiglass) and bolt that to the cage. You can also weave fleece though the bars of the cage, that is probably the cheapest, but also the hardest to keep clean since you will need to unweave it to wash it. Depending on the cage you have you can also just get deep metal pans, but that is not really cost effective, but it would also solve the issue of plastic pans if that is what you have.
I haven't bothered with scatter guards, I just sweep up around the cage.