Walmart discounts a selection of airbeds, with prices starting from $7.97. Shipping adds $4.97 or get free shipping on orders of $50 or more. (Select items may be available for in-store pickup.) A couple of best bets via pickup:

• Intex Twin Waterproof Vinyl Airbed Mattress for $8 (low by $9)
• Intex Queen 22" Rising Comfort Airbed Mattress w/ Built-In Pump for $40 (pictured, low by $8)