The best you will find will be in the classifieds here, if you are just shopping in the US. The downside of the 70 series search process, IMO, is that they are so tough, they are often beaten to near death, but they won't die. This makes it tough to separate a true gem from a pig with lipstick.
Get to know the seller and their history with the truck (build threads, etc), and, be prepared to spend a bit (seems like you get that part).
LHD vs RHD is a big price jump. Non turbo 1HZ vs the direct injected turbo engine choices also make a big $$ difference. So a good fixer upper 7x series will be from sub-10k to the 20's and will need lots of baseline/restoration/upgrades-big $$. Break up over 30k and on to 50+ + + and get into some really good ones. If this is your all around truck, it is still cheaper than anything new. I can't recommend one enough, even though mine give me fits sometimes (fixer upper stuff)
