I saw the scarves below at TJMaxx and they were all priced between $12.99 and $16.99! So no excuses that you can't find or afford scarves! I've also seen a good selection at World Market, Old Navy, Gap and Target. Infinity scarves are especially popular this year, and I just got one for $15 at Francesca's.
Here is a video that shows several ways to tie a scarf, and a Pinterest pin with more ideas. I don't think there is a wrong way to tie a scarf, just have fun and give them a chance!