Recettear is a game in which the player character runs an item shop in a generic fantasy world. You fill your shop with swords and wizard robes and such, you haggle with customers over the prices, and then you use your capital to stock better items and repeat the process.
The reason I'm posting the game here is because one of the best ways to get items to sell is by dungeon crawling. The player character doesn't fight, so you hire mercenaries to do it for you. You play as the mercenary in randomly generated dungeons full of monsters, traps, and treasure. It controls something like A Link to the Past.
You can loan equipment items you own to your mercenary to help them last longer, so you do have to decide whether the income from selling the equipment is more valuable to you than the extra power you get from actually using the equipment.
The best solution is to sell your strongest equipment to your mercenary buddies. That way, not only do you get the income from the sale, but you also still get to use the equipment when you play as that mercenary in dungeons.
The visuals are way too anime for my tastes, but I thought the gameplay was fun. It also can get pretty wordy, but the game lets you skip dialogue whenever you want by pressing the escape key.
A less ambitious, but more polished and (in my opinion) fun version of Elona might be a good way to look at it.
Currently there's no way to purchase the full version in english, but a demo is available which lets you play for one in-game week.
The official site of the english translation is
here.