cheapest charger ~200 https://gun.deals/search/apachesolr_search/charger
about 300 for take down version, just for comparison https://gun.deals/search/apachesolr_search/charger%20takedown
found lower https://www.pmacamfg.com/products/10-22-breakdown-stock-adapter?variant=7046103427
if you want a stock lower with ar buffer tube adapter, save 50 ish. https://coppercustom.com/accessories/pistol-brace-adapters/copper-custom-ruger-22-charger-ar-pistol-brace-adapter (might be cheaper options)
might be able to use ak folding stock adapter https://www.primaryarms.com/utg-ak-47-side-folding-stock-adapter-tl-k7fad01 (will report in a month or so if this works)
still trying to find stock,
close-ish https://www.primaryarms.com/sb-tactical-sba3-pistol-stabilizing-arm-brace-black
this plus a pistol buffer tube might be it https://www.rainierarms.com/gear-head-works-tailhook-mod-1/
edited a lot - adding parts and adjusting links