Arcsoft has got a coupon available which is good through the 31st of October. It is 30% off their regular prices and can be applied to any of their software, not just TMT5.
The coupon is Halloween.
TMT5 is the best software available for blu ray playback on your computer in my opinion, so if you're interested, this is a good discount. Regular price of TMT5 is $99, so this takes it down to $69.