Connect a CV7-V is very simple, the communication protocol is the NMEA0183 standard, such as GPS.
Just manage a serial link at 4800 baud, 8 bits, ASCII.
We use the phrase MWV ($ IIMWV) for the anemometer and wind vane ultrasonic sentence XDR ($ WIXDR) for the temperature of the wind.
For a short distance (<2m) between the sonic wind sensor and the card, you can connect the wire directly NMEA- wire to µprocessor Rx and 0V reference. For a long connection (up to 300 m), it is preferable to use an opto-coupled input.
For RS232 input, you use the NMEA + wire and 0V reference.
The price range that you found on the web is for CV7, ordered by 100 pièces and ordered by one piece.
Contact me by mail for full price liste.