Do the Udemy courses special offers ever expire?

I'm wanting to take a beginners course in C# in January when I get my new gaming pc (last one died in the summer) and I see Udemy has a lot of courses in C# and every single one is on offer for £15 some reduced from like £100 and the offer expires in 16 hours, wondering if I should buy it now while its on offer or is Udemy kind of like a furniture store they always seem to have offers on and never sell at the full price?

 

They seem to have sales pretty regularly, but if you can, I'd go ahead and buy the ones you want, when you see them on sale. They are supposed to be available to watch forever once you buy them, and you get updates, so you can work through them whenever you get your new computer set up, but you'll still get it at the low price.

 

Depending on the course, it will be marketed frequently at an affordable rate.

If you're interested in an introduction to Unity course created in partnership with Unity, here's a promo link that'll be good through the holidays.
https://www.udemy.com/the-ultimate-guide-to-game-development-with-unity/?couponCode=UNITYCOMMUNITY