KMS Tools in Canada has clearance prices on Nova chucks again. They have G3 chucks with inserts and jaws for $90CAD, or ~$65USD. Shipping for 2 was $28CAD, which came to about $150USD total for 2 chucks. One caveat: the last time I bought clearance Nova chucks from KMS (a pair of Supernova 2s last year), they were the older version that tightens counter-clockwise, in case this bothers you. (I just put a drop of red nail polish around the key holes on my "backwards" Nova chucks to identify them quickly. It's a little annoying to have some chucks closing one way and others the opposite, but it's less annoying than swapping chuck jaws all the time.)
www.kmstools.com

Nova G3 Chuck Super II Standard Insert Version
Fitting nicely in between the Nova Midi chuck and the Supernova 2 chuck, the G3 is an economical option