Flex I/O Digital AC Output Module with 8 isolated outputs, used in PLCs, and available new, used, or refurbished from automation suppliers, with prices varying significantly by condition (e.g., new around $200-$300+, used ~$60-$120) from sites like eBay, PLC Hardware, IQElectro, Radwell, DO Supply, and SIGMA Surplus. "Good prices" depend on the supplier and whether you need new or refurbished, with surplus/used often being the most economical option.