Self Powered Sub Recommendation

Hi there r/livesound! Just discovered this /r today, we're in the middle of getting some new gear for our band and figured some third party ideas might helps us out!

We're an indi hip hop band called HDninja. 2 Vocals, drummer, bass, guitar. What we have:

2 shure pgx/sm58

1 smallish bass rig. ~700w, 2x10 sitting on top of a 1x12. Does fine until open B, then, not so fine.

1 guitar combo, 1x12. Loud bastard. Usually do fine without micing.

2x 15/horn Nady (i know), Crown XLS802 (1600w, works with the Nadys as well as anything could work with a Nady)

Mackie (i know) 1202vlz pro

3x DBX 266XL

1 Behringer (yup) Feedback Destroyer Pro

LED lighting, pars, movers, strobes, synced to click sent to drummer (this guy), yadda.

Our lil mackie only has 4 mic preamps/insert points, pretty limited. Mics each get compression inserts, kick (beta 52) on 3 and bass DI on 4, both get compression inserts. I roll mids and high off the bass, really just need to reinforce anything below 60, same goes with the kick drum. The problem is, the mackie EQs are awful and fixed. Is there a cheap rack unit semi parametric EQ that can be had for under $100 I can use on the bass and kick drums? Would love to have it line before gate/comp. Are we better off dumping this mixer and getting something else?

We badly need a sub. We only mic the kick and bass when the venue has a sub available. We've been eyeballing the JBL MRX 18 and the Mackie SR1801, and finally, the Yorkville LS801P. Is there a cheaper way out of this? Really just need some thump for the kick. I'm not doing any fancy dynamics or double bass work and I'm totally fine squashing and EQing the kick to hell and back if it means we can get away with using a Big Bobs Gun Racks and PA style sub, you know, something stupid cheap.

Figured I'd post the entire setup here in case we're doing something way wrong, or our limited gear could be put to better use.

TL;DR: Need super cheap powered sub for under $500, 2 channels semi (or full) parametric EQ for under $100?