I don't know what sort of idol you're after, but I got this one recently:

Came from Woolworths, cost me about £1.50, made of resin, painted up in about half an hour, and is one of those things with a spike on the bottom that you stick in plantpots.
Also, if that isn't quite right, I used the spike off the bottom of it to make this:

Nice, simple, easy to do, cheap and two versatile terrain pieces in minutes.
Hope that helps.