I know here in the US, most Absinthe is around 50 - 70%. There are different grades of course that you can get. If it tastes like OVERWHELMING black licorice, you've bought a cheaper blend. Real Absinthe should have a hint of that taste but be pretty mellow. I know you have to dilute it with water ( usually 3 to 5 parts ) or it's just unbearable! ( Wish I'd have known that prior to trying it that night ) It's close to Anise from what I understand, but I don't know that for a fact. All I know is I got drunk REALLY really fast and it took everything in me not to puke. ( I didn't go go me! )
As far as price, I know the 70% we bought that night of hell cost me around $50 bucks for 8 friggin ounces. This was years ago, so I'm not sure where the prices are sitting now. Also, we bought it from a little liquor store, so I'm sure their prices were much higher.

I just know I never want to put that stuff in my mouth again! ( Again, because I loathe black licorice ) If you like black licorice, you'll probably love it.