Also consider Cuplock. Similar to Kwikstage but thicker metal and galvanised, so will not rust and will hold a better resale value. Look out on fleebay and include various spellings in your search (eg cuploc, cuplok, kuploc and kuplok) I found mine listed as Kwikloc and the price I paid, I could have made a profit by just weighing it in at the scrapyard.
Sell on when you have finished and get back most if not all of your money.