As I mentioned in an earlier post, I'm interested in some heavy .358's. Seems like there's a fair selection of 250g, but after that, it sorta drops off. Can anyone tell me some of my factory options for >250g, before I look into a custom mold?
And is there a good place on the web to find used molds for sale?
Thank you!

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Agree with Lloyd - good places.

Moulds (molds) are where you find them. Common moulds are often found second hand cheaply. Occasionally you'll find an older one no longer made.

Of note on .358 diameter. Check the twist. I have (had) a Lyman 358009 that would not stabilize in my Remmington 700 Classic 35 wheelen because the twist is too slow. (Comes out at about 285gr lubed and checked - which means it's length is too long for the twist.) So you'll find a lot of moulds for shorter (lighter) bullets in this caliber, because only the 1:14 and 1:12 twists will stabilize the longer boolets.