[Papyrus nods along enthusiastically. Monika already gave him a little insight into the fine and respected art of haggling, and while haranguing the shopkeeper into giving things away for free probably wasn't a winning strategy... Insisting on testing the wares just might do the trick!!!]

Yeah!!! Hey, [he addresses the boar,] do you know a good place for that? Testing weapons... Shooting at distant targets... We won't be long!

[...But, well, Papyrus rolled an 8. Even with his +1 Cha, the boar doesn't look on board with this plan. "If you want test them, and return them if you're unhappy - and they're undamaged," the boar insists, "then trade something as collateral." So, like a normal sale.]