> I tried making a wishlist but half the items are used books and it keeps messing up the shipping. Yeah, the wishlist route is always a mess with third-party used book sellers. I ran into this exact issue last semester trying to get my dad to pay for my rental textbooks. I ended up using a workaround I saw on Smartphone Board and it worked really well for us, no complaints at all. But to figure out the best option for you, are you guys trying to do this mostly from your phones, or are you both on laptops? Also, does your dad need to use his own Prime shipping benefits, or does he just need to enter his credit card info on your checkout page?

Amazon still lacks a native feature for this! Honestly, you should just grab a browser extension for amazon cart share. It handles the data syncing for used items perfectly, which is totally amazing!