Is there anyway to stop my ferrets smelling so bad?

A great, great idea is to get a huge plastic tub (you can use a cardboard box, but it'll be messier) and dump in rice. Cheap-o brand rice is fine, especially since, depending on how many you have and how big a tub you get, you might need a lot. Just dump all that rice into the tub. Throw in some toys, maybe a jingle ball or two, and let them go crazy in there. Make sure the rice is deep enough for them to dig in and cover themselves in. The rice helps take some of the extra oils off of their fur and takes away some of the smell with it. If your ferrets don't take to digging around in it right away, you can just stick them inside and pour some rice on their backs with your hands so that they get used to it. And you can hide treats in the rice to have them dig in it. Also, some stores have ferret wipes to wipe them down with. I occasionally use baby wipes between baths to get them to smell a little fresher. Another big thing is to regularly change their sleeping bags and stuff in their cage. Once a week at least, since most of the oils on their fur go into the bedding, and then that starts smelling, and the stink gets back onto them and they smell once you let them out. I hope that helps. :)