May be we can get a donation from other members as well and create a wallet whose private key you or an escrow can hold and give it to the winner at the end of the day.
Holding of anyone's personal funds by myself would be a really bad idea to proceed with as there would be unnecessary chaos among other members who are not really willing to trust me with the money. We can hire either someone like
DarkStar_,
krogothmanhattan or
bL4nkcode (probably there are more reputed escrows) and I guess they wouldn't be imposing any fees for the escrow amount as this initiative is for a good cause and not for trading goods as such.
Yup, I can escrow for free for this if needed. Let me know if you end up going ahead with it.