I'm still gathering information, and perhaps people here will be able to add info on the current salt list (to fill in the holes) or additional salts not on the list. Right now, the page is non-editable. Eventually, I'll get up an editable page where you can enter in your own target salinity and the price you pay for salt.
The results may surprise some of you!
https://spreadsheets.google.com/ccc?key=0AkNa58B3iG3GdGItUGFLVnpYb3VTNkd...
Instant Ocean/Reef Crystals also sells 160g buckets as well as 200g boxes. The boxes give you more salt, but less bucket 
So, I dunno if "free" bucket counts for anything, aside from $4.
V
it seems salinity aquavitro is in my future.
Very interesting!
Nice analysis.
Keep em coming.
Good work, it makes me rethink using Seachem reef, might as well go Aqua Vitro since it costs just about the same per gallon- plus it's got the 'bucket factor' going for it.
I would give Salinity a shot but none of the stores near me carry it and I can't find it online. Oh well, I guess reef crystals is working fine.
Erin, I got mine from Karson. At the time, he had 4 buckets. I got 2 and someone got another. He may have 1 left or may have got a new shipment.
Not terribly close but as close as it gets.
Yeah, I consider Karson to be not in my area. However, since I go down there for our meetings maybe it would work okay. Hmmm.
Erin, let me know if you want me to pick you up a bucket from Robert at Neptune.
Aqua Vitro products are not available online, they support LFS.
Erin, call Aquaitc Rocks & Supply in Manteca, Doug is the exclusive supplier outside of SLS, perhaps there's a source near you or a store that buys stuff through Doug that would be willing to order you a bucket or two.
Another thing to consider in the "price" of the salt Tony is the cost to get the params besides salinity up to reef standards (i.e. the additional calcium and alk you need to add to IO)
Bryan
Burbingame, CA
My 180g Tank build and progress Link