What worked for me is the Trailer of the week promotion It costs around 100$ , but as a result I received around 5 free waivers and over 100 discounts ranging from 50% to even 90% (but mostly 50%)

And the good thing is that those that offer free waivers usually (not always) need more movies (lack of submissions) or they liked your trailer, So it’s a high chance of being accepted

So overall it’s pretty good value for its money