For Prime members only, Amazon offers the Tide To Go Instant Stain Remover Liquid Pen 3-Pack for $6.79 $5.99. Clip the coupon and order via Subscribe & Save to drop the price to $3.94 with free shipping. That's $2 less than you'd pay at a local retail store, although we saw this for a buck less in February.

Be sure to cancel Subscribe & Save once your order ships to avoid being billed for subsequent shipments.