prototype prototype

I have a simple product i want prototyped it is a sock holder that can hold socks in a washing machine. the whole item with socks still in it can be taken out and hung up on a clothes line and then in a wardrobe. It is about 1000mm long by 80 mm wide by 2 or 3 or 4 mm thick. I am look for the device to be firm enough to hold the socks and flexible enough to fit and go through the washing cycle I am looking for a final physical product and costings to have it made in larger production runs of say 10,000