Walmart offers the Nostalgia Electrics Peanut Butter Maker, model no. NBM400, for $26.65. (Amazon offers it for the same price for Prime members.) Opt for in-store pickup to avoid the $4.97 shipping charge. That's the lowest price we could find by $3, outside of the deal below. This 150-watt machine grinds your nut or seed of choice into nut butter that can be stored for up to two months.
A close price: At Blinq search "NBM400" to find it for $28.09 with free shipping. Note that new customers can apply coupon code "SAVEBIG10" to cut the price to $25.28.