sublab

Future Audio Workshop has a solid deal going on for SubLab. You can save up to 85% on the standard and XL versions, along with bundles and expansions. They really cater to bass sound design, so if you're into that, it might be worth a look. You can find the deal here: https://www.pluginboutique.com/meta_product/1-instruments/4-synth/5661-future-audio-workshop-sublab-xl-sublab-expansions?a_aid=620857295e7f3.