Amazon offers Prime members the Prismacolor Water-Soluble Colored Pencils 36-Pack for $22.50 with free shipping . That's the lowest price we could find by $11. They can be used either wet or dry.

Non-Prime members can receive free shipping when they check out via Subscribe & Save; be sure to cancel once your order ships to avoid being billed for subsequent shipments.

Update: The price has dropped to $21.16.