A LOT of models aren’t available - certain types are flooding, but huge variety are just impossible. Decent shotguns are thin as paper.
Most ammunition and components are still impossible to find - 30-30 Win is nearly impossible to find outside of near-scalper mail-order rates.
Have you checked Ammoseek?
Lots of reasonablely priced 30-30.
Shipping drives up the cost, but you save time and gas by not driving, to get it.