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Steel Threaded Rod 3/8in

Threaded Rod (Allthread) Coarse Zinc 3/8"-16

3/8 in. x 10 ft. Galvanized Threaded Electrical Support Rod

Steel threaded rod 3/8in 

Don't need galvanized, ie zinc plated is fine.

http://www.homedepot.com/p/Superstrut-3-8-in-x-10-ft-Galvanized-Threaded-Electrical-Support-Rod-ZR1038/100207537    $6.52 for 10 feet

http://www.dunnlumber.com/Store/ProductDetail.aspx?pg=0&pid=14050    $7.79 for 6 feet.