Look for a used analog 1% Soligor Spot meter. Attach a Zone Scale to the barrel and you'll be good to go. They are selling for $70 to $100 (approximately) on ebb.
If you want a new Pentax or Zone V1 Pentax spot meter, you can get on a waiting list for one from Calumet. The wait time is about 6 months. New prices are $430 and $579.