You could also have a local machine shop cut you a taper bar from a piece of aluminum.
You'll need some mounting brackets and a sturdy base.
The delrin option is nice, as long as you don't plan on changing tapers on a regular basis, as it takes quite some time to set it up.
I'm having a local company make an extra bar for my taper shaper. I have 1 long taper groove and a 3c groove on one side and a jump and break shaft on the other side.
I don't remember what I payed for it right now, but it wasn't that much..