Please don't say "schump". It might be OK if you were legitimately part of the 80s/90s UK Commodore scene, but other than that...my word what an annoying term. "Shooter", if you please.
Anyway, back on topic, I buy almost all PCE games from Wolfgames, eBay, or people on this forum. eBay prices for PCE games usually aren't that jacked, not like US games anyway. The prevailing eBay rate for a random Solider game or whatever isn't much different that it would be anywhere else, and its probably cheaper than it would be in most of the stores that actually carry PCE.
I don't see Hanatakadaka!? on your list. Get that. Prices varies widely from $15-50 depending on the way the wind blows. Also, Soldier Blade.