Here's a light on ebay. i mean, it's a little pricey but if you want a street light that badly it's not a bad price, especially since it's brand new. You're really not going to find a street light dirt cheap if you don't have contacts. The only way you can ensure that you get a light is to save up and buy one. My M-250R1 was 80 bucks with shipping and my M-400 was about $150 with shipping. they're not cheap that's for sure. Fortunatly those were the only two street lights I've had to pay for besides the NEMA head from Jace, which was just like 20 bucks for shipping.
I'm thinking about asking a contact i have with the electric company for a few removed light fixtures. The most common reason the lights get removed here is for bad igniters. If i can get two lights, i will restore them and send you one for the cost of shipping (probably 30-50 bucks) if i can sell the other one. I would need to sell the second light first to cover the cost of the restorations for you. So if i were to sell the other light, whoever bought it would technically be paying for your light too but they wouldn't know it... And that's if i can get a pair of lights. I haven't asked yet and I'm not too sure if i'm going to go through with it. It will be a HPS light for sure, probably a GE M-250R2 in either 50, 100, or 250W HPS. If you're interested and i get the lights, we can discuss details then.
I hope you can get a light. The first street light is always the most special. My OV-25 has a special meaning to me becuase if it wasnt for me getting it for christmas, i wouldn't have ever found out about other collectors. I had googled "Westinghouse TYPE OV-25" becuase it was embossed on the refractor door and found David F's site and from there found the LG and GoL when it was founded.