I experimented with different sleeves including ones from MTL and Mayday Games (via Amazon or ebay). The ones that I found the best value are from docsmagic (
here). They are available via Amazon also, but I think they are less expensive on their own homepage. These are thick, sturdy sleeves that make for a very nice shuffling experience.
However, I have the base game and the WGUMCD expansion (~1170 cards) and the two boxes are almost full with all of these cards sleved.
You might prefer to only put all action cards into these thick ones and have the rest be in thinner (and cheaper) ones like
these.
If you are interested, I could post a video of the "premium" sleves later and how they handle.
