Speed sensor question

[blue thunder]

About a week ago my speedometer stopped working for the first time since I got my SVX in 97. Check engine light came on soon after. I got code 33 speed sensor 2. I have parked the car since then. I have searched for this part online and don't know if I have found it or not. I think auto zone has it for 249.99 if thats the right one. Are there cheaper alternatives? There are two of these. How do I know I am ordering the right one? Any input appreciated in advance.

Mike