I used to know someone we called Beeb.. I wonder if its you???
Anyway Powder coat colors are based off a EU color pallet called RAL. In addition to RAL colors many powder manufacturers have developed their own custom colors at request or to sell to the market. Many powder manuf are willing to custom mix a color but because of the way they have to make it there will be a minimum batch size usually 50 - 250 pounds and they'll charge a premium price for developing the formula too. I think you should be able to find something pretty close. Look at RAL5012
I used to live on LI so I know its expensive there. The coater that gave you the price should know his costs and profit requirements and if they're not foolish they'll be fair. I'm in NC now and my costs are not as high so I can charge less. I would shop around a little before I spent that kinda dough. If you can't find what you need then Automotive Polyurethane paints would be my next option. They're durable enough for cars so a bike should be OK too. Automotive paints are easy to mix and match and you'd probably have better luck if the color is 1st priority.