I've been playing an online game in a Japanese neighborhood. And someone said that "何かいるものありませんか " in return for something which someone gave to her. I actually understood that she said "Isn't there something I can give to you in exchange?" But I had never heard this word (かいる) before. Isn't it supposed to be かえる? I'm really confused. Is かいる a common word? Could someone explain this? I couldn't find it in the dictionary?