Hey all,
Finally, arguably the best RDP client for Android is on sale!
Direct Purchase from Xtralogic - $10.95US, was $24.95US
Google Play Purchase - Linked - $14.49AU was $23.37AU
Unfortunately I cannot find details on an expiry, just report it once this occurs.
[Source]
You can get it direct from the creator for USD $10.95 here http://www.xtralogic.com/rdc_buy.shtml
A user review on Google Play mentioned it was cheaper on the creator's website and sure enough, it is still true.