Things that are heavy, things I can't buy nearby, and things that are cheap or on sale.
この場合、次のような言い方ができますよ。
A: What do you usually buy when you shop online?
「オンラインで買い物する時、大抵何を買いますか?」
B: Things that are heavy, things I can't buy nearby, and things that are cheap or on sale.
「重いもの、近くで買えないもの、安いか特売のものです」
ご参考まで!