@sterling what kind of sand is it? something special you need to buy, or something you can mix yourself from raw materials? i have access to lost wax casting equipment. really cool to use. but i always wondered about sand casting for bigger pieces. (brass/copper).
Chinese graphite is exported to many countries. Maybe China is a choice for you to buy graphite blocks.
I've bought graphite blocks, rods, plates, moulds and crucibles from China, with no issues. Only small quantities though...