I've never heard of most of these but some cheap months if you're interested to try.
Remember to cancel before the end of the last cheap month.
Paramount+ channel $3.30 per month for 3 months
These channels $0.99 per month for 2 months
AcornTV
AMC+
Be in Sports
Britbox
Docplay
Hayu
Hopster Learning
iwonder
Lionsgate+
Love Nature
MGM
MUBI
OutTV
Rialto
Shudder
Stingray
The Great Courses Signature Collection
P1r4t3 for $0 a month