Exile is still on Spiderwebs' website, but the whole Geneforge and Avernum series are on Good Old Games for around $12. For Avernum, that means you get seven games for twelve dollars. Geneforge runs $15. I played the shareware for the first three Exile and the first three Avernum games. I never tried Geneforge, but I might here soon.
I found the links for both game series, if you're interested.
http://www.gog.com/game/avernum_the_complete_saga
http://www.gog.com/game/geneforge_15