Are there some people who don't pay such a small amount like this in one month?
Are there people who make multiple payments on a small amount of money like this?
この場合、次のような言い方ができますよ。
ーAre there some people who don't pay such a small amount like this in one month?
「こんな少額を一括で払わない人っているの?」
ーAre there people who make multiple payments on a small amount of money like this?
「こんな少額を分割払いにする人っているの?」
multiple payments で「分割払い」
ご参考まで!