Brian,
You may find wool yardage but I don’t think you will find the really fine (thin and low weight) Merino. Regular Merino is OK but what you want is the really lightweight new Merino. Watch for sales on the stuff.
OR
You can get silk weight Capilene by the yard at
Outdoor Wilderness Fabrics
They call it “Wickaway Pique but will tell you what it really is if you call them.
You might work with some of that first to practice with and then if you get the real stuff you should be able to sew with it easier. You might even decide you like the silk weight stuff well enough to just use it. I think I made 4 or 5 things out of the Silk Weight before I cut up my #2 Wool Crew.
If you do decide to buy something made out of the #2 wool to cut and make something else out of it – buy the largest size they have. You get more material for the same price of the smaller sizes.