Mine was $2.00. I targeted a very competitive keyword. The ppc bid prices for it are over $10. However, looks like there are a lot more behind the scene things to determine how much you will get paid for a click.
I got nearly 1,000 total clicks today.... unfortunately I can tell you the average click is quite low. heh
I've had clicks up to about $1.50, I think the more important question might be is what is the highest paying topics? btw. Adsense mobile is consistently making me about $0.80/click.
I have no idea what the highest ever is but in the last 12 months I have had 2 $25 clicks about 3 months apart.
$2 was my best here, wish they were more frequent. Those mesothelioma sites would have done well when it was so popular (and if you had an actual good site).