get any aragonite sand(dry), and seed it with ls, it will become live, and you can buy dry sand from hardware stores for @ 5$+/- for @50 lbs, just be careful what you buy, i don't know what is available out there, but if you shop around and check back with what you find, someone will help you to get the right stuff, or someone may chime in and tell you what is available locally for sand in your area(that would be safe for your tank)
just make sure it is aragonite (first choice)
or silica, or quartz(i have heard this is ok too)
sand