I've seen the angle iron pegs in use but haven't used them personallly. I've often seen them being used by the more mature generation. I've been told that you can sometimes find them being sold at the local markets for not very much.
As for the tarp saver thing, I've een them too but I use a spreader bar to create a ridge so have never needed one. I'd be worried about it falling over if the tarp got away. But then if the tarp got away you'd be having much bigger issues!