I would think you could get some decent quality strings for around $50 or so, though I haven't paid for strings in so long that I'm not exactly sure what the market is bearing right now...
And $70 for Zebras? [

]I wouldn't pay $10 for them. Ask any custom stringmaker out there how they stay in business, and they'll probably tell you it's building strings to replace those crappy stock Zebras.
As far as where to get a good set, I think someone mentioned PMing Gibblet here on HNI; you can also get an idea of what you're looking at by going to
www.vaportrailarchery.com/strings.asp. There's also a very good color selector chart there too.