For the next ~24 hours there is a very good deal at waves where you can grab the Bass Rider plugin for just 29$.
Bass Rider is an innovative, easy-to-use plugin that rides bass levels automatically. A companion to our popular Vocal Rider plugin, Bass Rider delivers perfect bass levels, without changing the natural sound of your bass. Optimized especially for the frequency range and envelope characteristics of bass instruments, Bass Rider covers all the basses: DI, amplified, acoustic, synth, upright—you name it.
A real timesaver with dedicated studio and live components, Bass Rider keeps bass levels in check and solid throughout your mix. Unlike a compressor, Bass Rider works note by note, without disturbing their inner dynamics, so they sustain and decay naturally. Best of all, since Bass Rider keeps your levels steady with automatic gain adjustment, now you can focus on the feel and flow of your bass—and use compression to add color and character.
With Bass Rider, you’ll never mix bass the same way again.
More info and download here: Waves | Bass Rider