I sprinkle in some bs, and then a sprinkle a few drops of essential oils on a wipe and throw it in. I find the orange oil to be nice and strong enough to keep the stink away.
There is a recipe for homemade deodisks, although I have never tried it because I don't have a good spot for one in my make-shift pail. You make a paste with bs and water, then add drops of your favorite e.o., then pour into muffin tins lined with muffin papers and let dry. They're supposed to last a few weeks before fading away, and then you can crumble your disk into your wash!