You might search the museum-ed.org listserv archives.  This topic was 
discussed a couple (few?) months ago on that list.

On Sep 14, 2005, at 8:29 AM, Keni Sturgeon wrote:

> Hello All,
>
> One of my new docents happens to sit on the board of a foundation that 
> funds educational opportunities for children.  He is interested in 
> helping us underwrite some of the costs of buses for field trips.  I 
> am hoping that some on this list offer such subsidies and if so, would 
> you please let me know how much of the bus cost you fund and has this 
> helped to increase your school attendance?
>
> Thanks,
> Keni Sturgeon
> Curator of Programs and Education
> Haffenreffer Museum of Anthropology
> 300 Tower Street
> Bristol, RI 02809
>
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Peace,
Greta

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