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A great place to look is the ETH Gas Station:

It tells the lowest gas price you can use to be reasonably sure your transaction will go through, and how long it's likely to take. Using that gas price it also gives a dollar cost of a simple transfer, which at the moment is higher than I expected at 20 cents for a 20-minute wait, or 33 cents for a 3-minute wait.

For cryptokitties you'll have a higher gas cost; I don't really know how high but I think I've seen people complain about spending six bucks for cryptokitty transaction at a 60 gwei gas price.

It does not make much sense to use avg tx fee to see if a currency is suitable for micropayments. You should be looking at the min tx fee.

Also with various micropayment schemes you don't actually need an on-chain transaction for every payment.

For ETH, https://ethgasstation.info has not let me down.

That site is saying 0.3 USD. I wouldn't call that pennies.

Though, it's on par with credit cards.