Well, it depends GREATLY. I've seen a dry piece go from 10 bucks to 200, and a bubbler? 30 bucks to 600+ Realistically, a simple spoon will probably cost between 20 and 40 dollars, while a decent bubbler will usually go from 35 to 60+ dollars. If you want to get heady glass, expect to pay much more.
Anywhere from $15-$50 depending on glass thickness and quality. You can get some pretty nice bubs for $40-$50 and spoons for $20-$30 around here.. as in nice, I mean one that catches your eye and begs you to smoke out of it.
I think about 60 should be the maximum for a good-sized, fairly thick, single-chamber bubbler. 40 should get you a really good spoon, not anything "artistic", but something very thick, with good colors and a nice shape. That said, you can find better deals, depending on your location.
My spoon is very solid and I got it for about $20. And a solid bubbler could be anywhere from $30-60.
It depends on a lot of stuff. The head shop, artist, size, quality... Spoon range any where where from $10-$200+ depending on the size and design... I got my first spoon for 25 bucks and its a decent size. Bubblers are a bit more expensive. I have never bought one. Cheapest I have seen for one is about $30
I just bought a sick little color changing spoon for 32.50 or something after tax and the glass is thick too.