Greeneyes,
That's a major concern. I however, have purchased the majority of my lights through either Ebay or the Marketplace. I have had only one slight problem and that was with alight that was just a little slow getting mailed out. I read the comment feedback and found that this person seemed to have a problem with getting any purchase out that was over one hundred dollars. I don't know whether they were not wanting to part with such a sought after HL or just a coincidence. I am planning, (I've been planning since December )to thank all the people that have helped me increase my collection to the great size that it is. I don't think you'll have a problem but things do happen. That's why you have that pit in your stomach until the light shows up at your door. The other side benefit to this is you get to be great friends with the UPS and Mail Carrier.
Have Fun!