Nakayama Tritons. You could buy these and get rid of the bolt hole look completely. They have 6 spokes instead of 5, really. But the basic design is about the same. They're not as curvacious, but I think they'd suit the styling of the Elantra really well.
As far as pricing goes, I'm positive that www.tirerack.com has these available, as well as www.discounttiredirect.com. Another option to find where to look for rims on the net, is by buying any import magazine, and checking out the links suggested in advertisements.
Edit: Also, the cost of an entire wheel/tire combo, is really dependant on the kind of tires you select. You can get more expensive rims, but keep the overall cost down by choosing less expensive rubber. You'll need to answer this question: What is more important to you: the look of rims? or the grip of the rubber?