The hinge pin diameter is .372, the ID of the bushing is .375, the ID of the hinge is .456. You could buy a package of 5 - 3/8 x 1/2 bushings from McMaster Carr <PM 6389K445> for a whopping $3.62 in nylon, MDS filled for $1.40 each <6294K439> or UHMW for $7.69 each <57785K211>.
Make an arbor with a 3/8 bolt, pair of washers and a nut, chuck it up in a drill press and use a file or sandpaper to bring the OD down to .456 If you have access to a lathe, it would be that much easier.
The hinge is a little longer but I didn't see any longer bushings available. Maybe there is another vendor, but if you have them made you're not likely to do much better than that $60, especially out of Delrin. If someone does find them please post up, mine are getting pretty beat.