The Beckhoff EL2809 is a popular digital output terminal, and good prices can be found from suppliers like PLC Direct (around $137) and on eBay (varying with sellers, sometimes under $200), with Made-in-China.com also listing new options (US$80-300), but check for authenticity and shipping costs. Expect prices to range from roughly $130 to $250+ for new units depending on the seller, with refurbished or used options potentially lower.