not sure how much these things cost to buy new but when i was walking through the isles of B&Q i stopped at the section where they sell stainless steel rods.
i bought 1 for approx £3.50 ish which was 10 mm diametre and about a metre in length. 8 mmm was also availiable.
stuck it in my vice, started to bend the thing from the middle in kind of coat-hanger type shape and with a lump hammer smashed the ends upwards to hold in place at the hocks.
took about 10 minutes from start to finish plus another 2 minutes just to file the sharp bits away from cutting the exess bar.