There are many sites on the web...Glocktalk.com , and others where you can get parts. Also you can buy a Glock assembly DVD and learn the right way to do it. I have owned Glocks since 1980 and one of my first lessons is to have spare parts on hand. I learned to work on them years ago and I enjoy them. I like shooting them more.
Also, if I read you right, you said something about running yours with a pin gone? Major No. Those pins are for a reason as is every part of every gun. They don't put extras in guns.