I bought a beginner's viola a while back with the intention of learning some, but we never really hit off. In the meantime I rented a bass viol for a while and really enjoyed this one. Since I can no longer afford the bass viol, but still have the viola, I thought of adding frets to it playing it as a viol (on the leg and with viol bow technique). However, even gut fret string is a bit unaffordable for me at the moment.
What alternatives to gut are there for fretting an instrument that are reasonably low cost and effective?