"If you purchase this item, you will also receive a personal phone call" from Dykstra, the ad says.
Dykstra's initial reply to questions about the sale was "F--- you." He later suggested, "The Post should buy the stuff."
Dykstra has been in dire financial straits for years. He filed for bankruptcy last year and had to sell his 1986 World Series ring.
The Wall Street Journal reported last month that Dykstra struck out in a bid to have his bankruptcy case dismissed in Los Angeles court.