https://home.woot.com/offers/acrylic-paint-markers-30-pcs?ref=w_cnt_sc_is_1_tl 30-Color Waterproof Dual Tip Acrylic Paint Pens on sale for $8.99. Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.