>>12770890 (LB)
Before you buy anything check their sell-buy spread and what the shipping costs are. Then make a spread sheet to determine how much rise in price you need to break even.
Also check that they buy back an item as them same item they sell it. I bought a bunch of specific-year Silver Eagles from APMEX many years ago. When I sold them, APMEX treated them all as "Random Year" coins. The difference between theses items' premiums was significant.