I'd just run a AS/Roots deck.
Jessie (5k) Randy (1k) Karen (650) Nathan (1k)
Yookie (1k) Rico (1k) Tuck (4k) Gretchen (1.5k) In total that is - 15k for a pretty great Elo deck week in week out.
Bangers are good but they really lack on damage, in my opinion you'd be better of with Jungo
A cheap Banger half-deck? I suppose Garrik, Massiv, Chlora and Bubbles can work. It's how I got Kreenk LD.
Tho' Graff, B Ball and Randall are also certainly worth mentioning. I would use Randall instead of Bubbles nowadays.
And if you want them real cheap, other options Carlito and Gyro, 2 hard hitters who cost almost nothing. But I don't expect them to work very well.
There is no such thing as a good cheap bangers deck. Bangers kinda suck without Blaaster Cr and Beeboy.
For cheap power manip decks, I'd suggest all stars. Sigurd (1k), Spudd (0.5k), Randy (1k) and Nathan (0.8k) are remarkably effective for their price. Pair them up with a cheap attack manip clan and you're good to go