I have used the Munton's Carb Tabs before, but didn't think of them when I responded earlier.

They weren't my favorite, seemed like they took a long while to dissolve. However, they did the job, and there were issues with that beer (JZ's dry stout, bottled before all the fine bits settled out completely) that may have prevented them from working as well as they should. It is a lot of handling, I wore gloves when dispensing, my funnel wasn't big enough for them to slip down into the bottles. If you are constrained in how you can bottle, they are worth the try.