The Plastic Comb Binders I have seen are around $50 for a cheap one, they would do the job and are available in most chain stationery stores, of course you can pay a lot more, the one I purchased was around $500, but then I considered it well worth it. Once you have it you will find it so useful, the only problem I have had is it is just so quick, easy and cheap to print and comb-bind yet one more album of music, one can get quite impulsive about it, we are spoilt for easy access and large choice of music these days...