High Res Photos

You'd have to find out who took the shots and contact the original photographers.

I'm also keen to get some Canvasses made up at some point. I asked Kardy on here about using some of his pics once... but I didn't get a reply

As jamma said you'd have to contact the original photographer. Bear in mind though that if they were on assignment with a publication the photographer almost certainly won't own the image rights.

In any case, if you were serious, and wanted a serious response, it might be prudent actually pay for the images.

Yea - find a shot you like - figure out who shot the photo - contact them - then pay them for the use of a high-res photo.

A lot of old school shots were on film from slides and will need to be scanned to create a digital file.

Most Freelance shooters own the rights to a photo unless a publication or company purchased 100% rights. If you work for a publication or were hired direct to do a shoot, they the photo person may or may not have rights to the images.

Good old school high res photo should run you $100-$800 depending on what you plan to do with it.

http://www.buckleyphotos.com/

Paul has some amazing stuff, contact him and see what is available for sale.

You often don't own a photo unless you pay a lot of $$. You can buy the rights to a photo to make a poster or something that is not going to be sold or used for promotion. Often times you can't buy the rights to use a photo and sell that image without the rights of the photographer or who is in the photo. If you use it for personal use - probably ok for a one-time use fee. If you sell a T-Shirt or use that photo to promote a product or make a poster to sell, you would need to get a release from the person in the image as well as the person that shot the photo.
You can use the likeness as an editorial/news piece (magazine, internet news piece, tabloid newspaper ......) if the image was shot in public or at an event the photographer had permission to be at. But that photographer or whoever buys the rights to use the image can't use that persons' photo to promote or sell any product with their likeness without written permission.

Depends on what the copyright owner allows you to do. Ask GuyB, he's a prominent MX photographer in the US. If he can't help you directly he may know someone who can.