I had this exact same issue last year when I was ordering parts for a home server. Honestly, Cart To Link works well for this and I've been very satisfied with it.

• Just copy your cart items into it
• Send the generated link to anyone Works every time. It feels much safer than sharing login info or making things public. I havent had any complaints so far.

Coming back to this... honestly i would be pretty cautious about using random browser extensions since they usually want access to your data, but i totally get the frustration. If you need it done tonight, here is the breakdown of the most practical ways to handle it without spending extra cash:

• Third-party tools: Using something like Cart To Link is basically the only way to get a single URL for a full cart. It saves a ton of time compared to doing 20 screenshots. Just make sure to double check the prices in the final checkout because sometimes these tools dont pull the latest coupons or lightning deals correctly.
• The Wish List route: I know you said you dont want to, but if you make it Private and then use the Invite to Edit feature, it stays hidden from the public. It is tedious to move 15 items one by one tho, so maybe not worth the effort for a one-time thing.
• Shared Login: Honestly? Just give him your login for five minutes. It is free, zero risk of a third party seeing your info, and he can see the cart exactly how you see it on his own screen. I would suggest checking the shipping dates one last time before you buy. Sometimes when you share lists or use tools, the stock levels change and you might miss a delivery window for the chair or something. Good luck with the office setup, sounds like its gonna be a killer space once its done.