I purchased a pair of Nikon 7218's from Amazon last year for $89.10, but this model seems to now be discontinued are now much more expensive. I can say that the pair I got are very good and I use them regularly for astronomy.

If you poke around you'll find an active binocular astronomy forum at Cloudy Nights, and I've seen a few people recommend these Oberwerks or at amazon for $100.

I really think Binoculars are a great way to look at the sky and I hope you have fun!