Local Sewing Businesses
Hancock Fabrics- Often has 99 cent sales on patterns on 3 day weekends. You can sign up for their e-mail and they send coupons and a sales flier to your e-mail. Also, if you are a teacher or homeschooler, they have a discount card. Some locations are not as friendly to homeschoolers as others.
JoAnn Fabrics and Crafts - They also have 99 cent sales on patterns on 3 day weekends. They also have a place to sign up for e-mails where you can get coupons and sale fliers. Also, if you are a teacher or homeschooler, they will give you a card for a 15% discount. You need to have a teacher ID. Talk to your church school about obtaining one if you don't have one, or talk to me about other options. I like that they have some children's sewing crafts to choose from.
Hobby Lobby - I have not shopped here yet, but I've heard good things. Definitely a good local place to check out.
Walmart - Some Walmart stores have fabric and craft items. While convenient, they have a very minute selection. It is better to go to a fabric store and buy their items on sale. On occasion, Walmart will have something that they have at a better price than the fabric stores.
Never buy patterns at full price unless you absolutely have to! Most stores have them at least at 40% off, but it is even better to wait for the patterns to go on sale for 99 cents or $1.99.
Learn to Sew Websites
I am sure there are others, but here are a few to look at. You can also type in different things into YouTube and get all kinds of great how to videos. That's how I learned to darn a sock. This skill will work for sweaters too.
You Can Make It
Craft and Fabric Links