It's now march and forgot to get my flu vaccine for this year. Is there any value in getting it or should I just wait until next year?

Get it. Even though the flu season is coming to an end, there are still cases of it out there. Also, the more times you get the flu vaccine, the higher your immune response will be boosted the next year. Many years, the strains are the same as the year before.
Go ahead. Flu season is running late this year, i encourage people to go ahead & get a flu shot, even this late.