Help Required- Hi-Res Pics

[bvgs]

Hi I'm trying to obtain some royality free pics for a callender I am about to digitally print for a local helicopter training school. It will be a short run of only 100, thus the reason for trying to keep the costs down. Happy to give credit for the pic and send them a copy of the finished product. The pics on the board are generally too small thus the request for Hi-Res. Any help would be much appreciated.

Thanks.