Walmart offers the Crayola Washable Super Tips with Silly Scents Markers 50-Pack, model no. 58-5050, for $6.99. Opt for Site-to-Store pickup to dodge the $4.97 shipping fee. (Amazon offers it for the same price with free shipping for Prime members.) That's the lowest shipped price we could find by $7. They feature a versatile tip and washable ink.

Update: It's now available for in-store pickup only.