Hulu has done this for the last few years. For Black Friday, the service is available for 99¢/month for 12 months. Naturally, there's a catch.
To take advantage of the deal, you must not have been a Hulu subscriber for one month prior. If you are an existing subscriber in any form -- standalone Hulu or part of any Disney Bundle -- you are not eligible. Well, unless it's been a month.
How long will the sale last? I don't know. It's usually for around a month. I don't know if you have time to cancel and then take advantage of the deal a month later.
Are there any other catches? Not really. It's pretty straight forward. It's the standard $8/month Hulu service for $1/month for a year.
I know of people who have taken advantage of the deal on consecutive years by using a different email address, essentially rotating accounts year to year. In one year, they use the original email address, in the next, they use a second address. Then back to the first address. And so on. I'm not advocating that. I just know it's been done.
My Streaming Life has used Hulu since I began streaming regularly in January 2011. I used the free version (yes, there was a free version), them moved to the subscription service later in that year. I've stayed with the service ever since. It's a worthwhile service to me. And this is a great bargain.