If I ever need a mass quantity of shards, I set aside time, refer to this chart, then go gathering.

For wind shards if you're MIN you'll go to the Bramble Patch or Nine Ives next to little Solace (pop Llymlaen's Ward on the Increased Yield node to get 4 per hit) and mine the level 30 nodes, or BTN you'll go to south of Bentbranch