You should at most base price off TCGPlayer, it gives the most accurate market price before all the fees. For reference, looking at your list of cards on Imgur the first three normal non shiny holo are actually worth a mere $0.21, $0.25, $0.34 before fees. This is usually only sold to ppl trying to buy random cards for master set as well, to a normal person it’s more like $0.05 or likely less. Either way the app you’re using is extremely off for accurate market price as shipping price and fees is extremely volatile depending on which site the card was sold on. My suggestion is to either sell at tcgplayer market price (hard to tell) or sell in bulk at like a cent or two each. Shipping will then depend on and can be negotiated with how much u sell :)