... those plastic things that you can wedge into your fork and rear drop-outs when before you bung your bike in a bag for travelling, to stop any damaged? I'm looking on Wiggle/Parker, but it'd help if I knew what to call them.
I got mine for free from my local bike shop. They come with every new bike and are thrown out. Speak to the mechanic and ask him to put some aside for you. I do not know the technical name, but just explain what you want and he will understand.
You can also make some yourself using your wheel QRs and a length of copper pipe cut to the inside width of your drop-outs. Deluxe version includes a pair of large washers to protect the paint on the inside of your drop-outs!