If your`re after a good value easy to use mid-side compressor, for your buses
Cyclone Compressor is going for £5.95:
https://www.pluginboutique.com/product/2-Effects/8-Compressor/3471-Cyclone
Also recently picked this up aswell which has proved pretty useful
MSW2 going for £4.96 (stereo width plugin with graphic readout and modulation options)
https://www.pluginboutique.com/product/2-Effects/27-Stereo-Width/4431-MSW2
Trials available for both.