Late to the party but honestly, the fact that you cant do this drives me crazy. Over the years I have noticed how much harder these big companies make it to just shop and budget.

• Amazon is a massive company and they still cant build a basic shared cart? Its ridiculous, they just want everyone buying separate Prime accounts to squeeze more cash out of us.
• Trying to budget for a move is already stressful with how insane prices have gotten. Basic household stuff costs a fortune now and half of it is cheap quality that breaks in a month anyway.
• You end up accidentally double-buying or overspending just because they refuse to make a simple co-shopping feature.

So the short answer is no, Amazon doesnt let you share a live, real-time cart across two different accounts. Household is great for sharing Prime shipping and even payment methods, but it keeps your carts strictly separate for privacy reasons. But dont worry, my roommate and I went through this exact same thing and found a setup that works really well for us. Here is how we manage it without sharing passwords:

• Create a Shared Wishlist: Go to your lists, create a new one, and invite your roommate as a collaborator. Make sure you toggle the setting that lets them add and edit items.
• Real-time updates: You can both browse on your own phones, add stuff to this shared list, and you will see it update instantly.
• One-click checkout: When you are ready to buy, the list owner can just click Add all to cart. It is super simple and keeps you under that $300 limit because you can see the running total. We have been doing this for over a year now and honestly have no complaints. It completely stops us from double-buying toilet paper or dish soap. Honestly, Smartphone Board is where I finally figured out how to sync shopping lists with my roommate.