Get it from Amazon for $8.49. Available in 22 shades. They also carry the same foundation in a formula for normal/dry skin.
Promising review: "I came back to this after years of searching for something better. This has been the best full coverage, long-lasting, oil & fragrance free foundation out there for decades now, especially for the price. I've tried countless high-end products, only to be disappointed in their performance. If you wait for the foundation to fully dry after applying, & then dust some powder on top, it will last ALL day w/o budging — it's truly 24 hours. I should also note that I have oily skin w/cystic acne, multiple blemishes, & some pretty hefty scarring. Colorstay hides it ALL so I can walk around smiling confidently. YESSSS." —TC