The clamps can be found cheap at most stores that sell car stuff/tools etc. Always useful to have a couple with - especially the smaller ones. The bendy bit you can improvise with a two or three wooden laths (stiff, flat and light) about 12"+ long. You can usually find something in situ like a chair to provide a solid base. I had one lath with an old tripod screw glued to it so I could start from a video tripod with a fully rotating head.

A length of thick wire that can be hand-bent is also useful, as are a few industrial strength rubber bands. Duct tape takes care of almost all other solutions ;-) Thread a roll onto the shoulder strap of your camera case.

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