Origin are currently holding a Mega Sale with lots of titles up to 75% off.
You can buy The Sims 4 on Origin from $39.99
All The Sims 3 Games:
The Sims 3 Base - $19.99
The Sims 3 Starter Pack - $29.99
The Sims 3 Expansion Packs - $7.99
The Sims 4 Origin Mega Sale