A best bet is the Corel PaintShop Pro X5 Ultimate for Windows (pictured) for $39.99 before the above coupon, $35.99 after. (It is also available to download at this price.) With free shipping, that's the lowest total price we could find by $9. It features NIK Color Efex Pro 3.0 photographic filters, REALLUSION FaceFilter Studio 2, and more.
Update: As a reader found, coupon code "CORELUGSAVE20" cuts it to $31.99 with free shipping