There are lots of colliding galaxies, and lots of images of them. Most of the time they pass each other several times and finally form 1 Massive galaxy. There are even examples of 3 and 4 galaxies merging!
Here is an excellent picture of a 3 way merger.
http://blog.wired.com/photos/uncateg...birdgalaxy.jpg
And here is one of the better images of a 2 way collision.
http://www.spacetelescope.org/images.../heic0717a.jpg
Here is a gigantic 4 way merger...
http://news.bbc.co.uk/nol/shared/spl...9320/img/1.jpg
As for where to buy pictures like this, there are lots of people that will be happy to sell you a picture. Some of the better "amatures" out there with fantastic stuff are:
Hunter Wilson:
http://hwilson.zenfolio.com/f129011888
Garrett Grainger:
http://www.beachastronomy.com/main.php
Calgary's own Alan Dyer: No web site for him, but google his name and you'll come up with 1000's of links, books, articles and images of him. I know you can e-mail him, he's very approachable. You can also meet him in person if you really wanted to.
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Honda bros 400 history