Thanks Paul, BobR and everybody else for helping!
We decided to use the hikers resupply service of Eastern Sierra Suttle Service.
We do like to stay on the trail and because of that I find the costs reasonable, especially because we hardly have any other options when we want to stay on the trail.
I know it might be cheaper to arrange something with an individual person who would like to combine hiking and earningh some money, but for us this seemes a more secure arrangement.
I also became a member of the Yahoo Group. Great way to get a lot of information!
Marla