I almost always leave some wiggle room when I set my prices. Especially when selling multiple animals to one person I'll often work out a package deal. I make offers, and I receive offers, just part of the game.

However, I can't stand it when people send me ridiculous lowball offers, even worst is when they become irate when I refuse their offer and proceed to lecture me on how I'm asking too much and my animals aren't worth anywhere what I'm selling them for. I have a hard time not telling them to eff off.