I bought a couple of ebay items from them in the past(none in the last year). I had no problems with them and was pretty happy with the service.
When I bought items the listings were a bit different. There was one person claiming to be bringing Cosmo motors "kicking and screaming" into the 21st century with online sales. This person certainly seemed to know their stuff where parts were concerned and provided good info and service. Judging by the empty ebay store and disconnected phone # I would guess that this person is gone and the store is is out of business. Hope someone near Hatsboro,PA can confirm this for ya.
I hate Paypal about as much as I hate ebay. Necessary evils though, I guess. Unfortunately it seems as though you will have to go through them to get your $$ returned. Too bad about Cosmo

Good Tarozzi stuff on ebay can still be had from Jim-Hinshaw, an excellent seller who cares about old bikes. You can also shop from his store at fastfromthepast.com
Not so cheap fiberglass can be had at glass from the past( caferacingparts.com ) or airtech ( airtech-streamlining.com )