I am listing some marbles on eBay for someone I know who doesn't do online sales. There are antique swirls of various types, and some classic machine made oldies. Low starting prices and no reserve on most and perhaps all of these listings (I'm still working through a small bag of stuff and putting together the selling lots). Here's a link that will take you to the marbles listings only:

Caroline's Marbles on eBay

Keep checking back, I'm listing a few more each day as I have time. Thanks!