The stuff I have on order (went ahead and ordered it today) is 4/5oz and is pre-dyed black.
The hides very in the amount of usable material. It really depends on what you are making and what size the hide is. You will get a lot more usable area if you are making something like wallets or using for trim. If you are using it for stuff like clothing then you will have a lot of out fall.
You can get the idea of what they are. You can also get an idea of what people are asking for hides. This guy wants about $100 per sqft which is just silly.
http://www.sharkleather.net/sharkskin.asp?...in+Leather+Hide
Normal prices range from $25-$35 per foot. I am buying from the manufacturer and acting as the importer (not really, the import is being handled by the manufacturer, but there is no middleman markup). So to get a good price I had to buy enough to make a car cover.
I have no problem with selling a single hide. I just don't want to sell it by the foot and end up with a bunch of scraps. The hides are going to average 4-10sqft.