I love using Drops yarn from Garnstdio. The company has a large variety of yarn in their range, but mainly natural fibres such as wool, alpaca, cotton etc.
At the moment they are having a sale and save a massive 35% off 21 types of wool yarn.
I know you may be thinking of Spring or Summer knitting or crochet, but this great saving is hard to resist. Also for my Southern Hemisphere readers it is really good timing, because Winter is nearly upon you.
If you go to the companies site here, you will find details of where you can buy the wool.
My favourite places are :
Loveknitting (you get free shipping if your order is more than $50);
Winniethewoolwagon (Ireland); and
Happy Shopping !