home depot.
1.5" galvanized pipe. 12" long bolts with 12" x 3/4" nipples. put on collars you are looking at about 40 bucks total. i have a pair and they are awesome. i even put some 1" handles on it, which on the outside comes to about 1.25" so i have a choice of thick or thin. total, i spent 50 bucks. i spent more for for 1 45lbs bumper plate to put on them lol.