Walmart offers the Pentel Arts Oil Pastel 50-Color Set for $4.44. Choose in-store pickup to dodge the $5.99 shipping fee. (Amazon charges the same with orders of $25 or more and free shipping for Prime members.) That's $2 under our June mention and the lowest price we've seen. (It's the best price we could find today by $4.) These acid-free oil pastels blend easily and are ideal for use on paper, board, or canvas.