Maybe through Rainforest Foundation ...

Today I found a website that support runners to New York Marathon.

http://www.rainforestfoundationuk.org/s-International%20Marathons%202007
---on the webpage----
International Marathons 2007

With our travel partners, The Rainforest Foundation is able to offer you the chance to run a Marathon in almost any major city across the World. A small sample of courses is on offer on the left but if there is a marathon that you want to enter and raise money for The Rainforest Foundation then drop us a line.

We’ll pay for your flight, accommodation and entry if you raise our minimum sponsorship. We’ll also offer you any training or nutritional advice you might need along with fundraising tips so that you can hit your fundraising total.

The New York Marathon has for some years been our most popular so if you see that times or dates aren’t confirmed on this or any others, still get in contact so we can look to reserve you your place.

Berlin
Boston
New York
Rome
Tokyo
Please contact Nick Tuchband on 020 7485 0193 for further information or to see what other International Marathons are available

They are located in Central London, I'll go visit them this week. Meeting is much impressionistic than just talking on the phone. Less see if I can do it this way.