This was supposed to end on Friday but is still alive & kicking. You can also get:
Prices in USD
O&O Defrag 21 Pro for 1 PC - $10.00
O&O Defrag 21 Pro for 5 PCs - $20.00
O&O Defrag 21 Server Edition for 1 Server - $49.00
O&O Defrag 21 Workstation Edition for 1 PC - $10
Keep prices in USD for the best deal.
Download & install & run the trial with all features for 30 days for free to give it a try & then you can buy (these are lifetime licenses)
You can download from here
Do you really need defrag?
Most modern PC's have SSD and you don't really need to run defrag anymore.
Even if you need it, just get free alternates.