This has been happening a lot lately. This week a friend of mine bought a single share (just being silly to push the price up a pip, he figured it was worth the $9.95 brokerage) and it went through at the price mid way. On the public trade history it showed up as a cross trade, even though he'd just bought on market. Wasn't for TNT but the same thing happens all over the ASX. It's a relatively recent thing, I never saw this in my first 10 years or so of trading, but it has happened to me over the last year or so and I've heard others reporting it.
TNT Price at posting:
22.5¢ Sentiment: Buy Disclosure: Held