The best prices I’ve found are from Kleen-Rite on the ASCO valves. What are you using it for? If you need just valve body and don’t need the solenoid try looking on EBay.
Why do you need this specific p/n? I did a search on it and it looks like the only places its offered is online stores that handle discontiued electronics/motors and such. It looks like this might be a discontinued p/n. If this is a 24v nc 1/2" orifice solenoid or similar, I'm sure KR will have it. The only difference is it might have a new p/n.... Something to consider...