I just dug around on ebay and found a seller "galactica-museum" (who is maybe Chris Pappas himself), who is selling several authentic costumes and props from the old BSG! Of course the prices are no bargains either, but the items are really interesting!
Especially for fans of the Triad costumes: Apollo's original costume here:
https://cgi.ebay.de/Battlestar-Galactica-TOS-Original-Apollo-Costume-Prop_W0QQitemZ220382539836QQcmdZViewItemQQptZLH_De faultDomain_0?hash=item220382539836&_trksid=p3911. c0.m14&_trkparms=72%3A1229|66%3A2|65%3A12|39%3A1|2 40%3A1318
(man, how did you manage to hide the link behind a self chosen text, Dawg?? Do I need html knowledge for that? In any case it looks a lot better than my link! Frak!