LOl if I heard that quate right the Scrap yard guy sounds like crocodile dundee right? Thats how I heard it and about split my pants laughing. On to your question. those prices are about the same as my yard is offering here in colorado. Except for batteries. If you can get $3.50 a kilo but you have to have a tonne i would save untill my pickup was dragging the bumper then go cash in. 1 tonne would net you $7000 and what does the average batter weigh? Has to be close to 15 20 kilos at least. I know the batteries in my truck weight close to 40kg each. So your talking only 100 batteries or so per tonne?

Here is a website of a small yard close to me that list there prices. They are just a small yard that sells to the bigger yards in town so their prices are always a little low but a good guide for local minimum prices I think. I hope this helps you some.
http://66.166.133.189/fc/price.asp