Here is a nice inventory of army surplus turnbuckles. Galvanized. There are about 350 pieces. Length is about 27 inches closed. Opens fullest to about 38 inches.
Weight is about 3 pounds each. Your cost on a take all is $9.50 ea. Minimum order 100 pieces $11 ea. ((If 350 is not enough for you we have another friend who has about 7,000 of these beauties))
FOB is OK.