Yes, Lainzberg has some Gargoyles cels (bewarned- 
they're expensive).
http://www.lainzberg.com/

Ironically, Gargoyles was one of the extremely few 
Disney cartoons that I actually enjoyed (possibly 
because the animation staff was asian/Japanese?? 
and the storywriting is quite different from 
most Disney fare). It was very sad that this 
first-time foray into a more adult-presentation 
was doomed to failure here.. O_o