Perry,
No need to go to the chemist for sulphur, too expensive.
Go to your local garden centre and look for powdered sulphur, or elemental sulphur. It should be 99% sulphur or higher. Try not to get the granular version.
It's used as a soil amendment to lower the ph of the soil.
Dusting sulphur is fine as well, but don't get wettable sulphur either, it's a fungicide and not as pure.

It's easy to find the right one, just get the highest %age of sulphur possible. The last one I bought was in a round screw top container, I think it had 500 grams in it and cost $10-00, haven't even made a dent in it yet, enough to do 50 odd casts or more I'm thinking.

It does stink something terrible while you are melting it, and it can catch fire, melt it slowly, low heat.
Oil the chamber and throat area lightly before you pour it in, makes it easier to get out later.

Daryl, agree on the frosting, I know the books tell you they should be nice and shiny, but they fill the mould and are much more consistent dimension wise if they are a little frosty. I've never had a problem with frosty bullets.

Glad you like the bullet design, I've got a few of Dan's moulds with the step-shank, best thing I've come across to keep gas-checks on. When you select the gas-check version on his software, it states that it is cut for either Hornady or Gator-checks. Personally I use nothing but Gator-checks now, slightly thicker than Hornady's and guarantee a good crimp on. His GC shank is very nicely dimensioned.
You can also specify the lead you are going to use, and the mould will be very slightly cut differently to suit the alloy.

Jeff, It would be nearly impossible to cut a mould like a Hydro, the unfortunate part of bullet design with lead bullets is that they need to fall from the mould easily when cast, and not have too many sharp corners.
I'd like to be able to have someone do it though, it would be a good project to work on, but I'll bet the shape is patented, which puts a rather quick end to it.