Monsterslayer has a bunch! http://www.monsterslayer.com/Pages/SSConesBeadCaps/SSConesBeadCaps.aspx
I just did a search for cones in the search box and clicked on sterling silver. I believe they have some in other types of metals, just search their site.
I always go to monsterslayer first when I'm trying to buy metal things. They have great prices and are wonderful. I buy from them all the time. Oh yeah and the lowest prices on sterling and gold that I have found