Wool

This is a curated list of Amazon links, and as an Amazon Associate, Worthy Lion Swift earns a small commission from qualifying purchases. 

Clicking a link below will take you to the Amazon store in your country. The following countries are currently supported: USA, Canada, France, Germany, Italy, Netherlands, Poland, Spain, Sweden, and UK, with more coming soon.

Core Wool
Raw, unprocessed (but clean) wool for base sculpting.
16 oz Core Wool (~$35)
Enough for over a year of felting projects.
8 oz Core Wool (~$20)
Enough for many months of felting projects.
1.7 oz Core Wool  (~$8)
Enough for at least 2 SWiFT starter projects.

The wools below are just starter sets. 
Use the links as a starting point for exploring. Be sure to read the reviews to ensure you're getting a quality product.

Rough Colored Wool
This wool type felts fast. It works best for coloring flat surfaces or creating stiff, rough fur. It can also be used as a core wool for projects that would benefit from an underlying color.

Wool Buddy 24 color kit ($24)
This company is known for quality products. This set is 10 grams each of a wide-variety of colors. It is an excellent starter set.

Seven total ounces and fifteen woodland critter colors ($30)
This set has a lot of colors. Some are similar and could be blended to extend the amount to cover a larger project. According to reviews, the quality and wool types are mixed.

~ 3 total ounces and 8 fall colors ($8)

Fewer colors in this set, but a larger quantity of each.