Of you could just use this trick that I've also had to use before when I forgot something.Another snag.... PayPal only allows you to have 10 transactions in a single purchase. In other words, if you have 15 items in your cart from 15 different sellers, you will only be able to buy 10 of them at once. So if the same 15 items but from 12 different sellers, you just have to work it ahead of time and delete the lowest cost items from your cart until you are down to 10 sellers max. Still a good deal but something to be aware of.
Made a purchase on my eBay account, then remembered something else I needed. Was very easy to check out as guest and use code again - FYI.