AARP Carnival cards issues?

Asking for a friend. She's been trying for two days to purchase rewards for good Carnival cards for her upcoming final payment, but each time she gets to the check out, the website freezes and it won't proceed any further. We've tried different browsers, even her phone. Do they limit how many cards you can purchase at once, and could this be the reason for the hiccup?? She's got plenty of points, and is attempting to purchase three $500 and two $100's for a total of five cards. Is anyone e

We wondered if this was an option. Good to know for the future. But it worked out in a different way. We've yet to pay the deposit. Our PVP put an extended hold on the cabin until Monday (end of day). The gift card is scheduled to arrive by mid-afternoon, so I'll call him and apply it to the deposit. So for you UPS MyChoice users...it gives me an estimated delivery time, a 4-hour window, from late morning to mid-afternoon. In your experience, is that window usually accurate?