use code: 10thanks
Serial works with Steam.
Prices vary by the region you're in. The UK, Canada, and Poland are participating, and I'm sure there are more. US unfortunately isn't. I didn't want to post this in regional because I don't know which regions, and how many regions have sale prices.
credit /u/dreadpiratej from /r/GameDeals
Also, VPNs don't work on Uplay, it won't let you get through checkout :(