January 7, 2016 by: This post may contain affiliate linksOrganic Vitamin C Serum & Retinol Serum Holiday Gift Set Only $18.95 (Reg. $89.95!) For a limited time you can grab this Art Naturals Organic Vitamin C Serum & Vitamin A (Retinol) Serum Holiday Gift Set for only $18.95 (reg. $89.95!). This set is highly rated with 4.8 stars and over 400 reviews.