They vary a lot:
mlk sold at fliipa this month $271
apm sold for $1077 last month
car sold for $76,000 a couple of months ago
you see others for sale on the forums sales threads with little or no interest
LLL .info names I have looked at over the last few months that are dropping seem to get caught and re-registered straight away, which means people are prepared to pay more for new registration costs than for renewal costs.