Me I used well known astro shops on occasion but most is Ebay
I always cover myself (also I am a personal seller NOT a business with 100% A1 feedback on 1,500 sales)
1. Is the item you are selling (name it and give ebay number) in good working order
2. Are there any faults with the item
If they fail to reply I stay away
If the item arrives other than described I am fully covered for a refund.
I also buy items occasionally from the US and have from China ALWAYS making sure the full costs/charges are listed and understood.
I bought one item from the us $14 ALL tax/shipping included, I had a letter from Customs to pay $14 import, contacted Ebay and they made the company pay the $14