Good place to find Rubber Gaskets

Does any one know a good place to find some rubber gaskets. Home Depot is a worthless POS when it comes to shit like that, and all the plumbing shops around town don't have them in a 1" size.

I am trying to rig up a RDWC system with a 3/4" return pipe.

Goggle ?......

or u can do like i did i made my own out of strips of rubber and use a sharp razor

Search for gh grommets.