I choose no to replace, and the more expensive item ends up in my bag. No replace should mean exactly that. Grocery store actually still had sale items, not out! Do not expect users to respond to a text question such as "Is it okay if I replace...with?" I'm busy please don't text just follow choice, users are clearly trying to save time. Regardless of what you buy Instacart secretly marks up every price. The user is left with a bait and switch feeling at end of every transaction.