Rickochet - We are 70 miles from our nearest Costco so we often ordered online. The 'burr in my saddle' was not being able to get into the website over 3 hours continually refreshing my browser when they put the balls on earlier this year. Posters on here were reporting success in buying them in quantities exceeding the 2 box limit and they weren't members of Costco. When I did get in to place my order, by the time I then went to checkout for the confirmation, I received a 'sold out' notice. So, I wrote an email to customer service telling them of my experience with the facts and I would not be renewing our 'Executive' level membership.
Fast forward to another offering a month or two later and I was still able to log-in despite having cancelled the membership. My payment credentials were still loaded so checkout was a breeze and I received a confirmation. The day my balls were scheduled to be delivered, I received an email from Costco membership services informing me they had discovered my membership number associated with the order had expired. They took the high road and let me know I could keep them so I did not have to send them back.
With this offering, I noticed they again state it is for members only and there is a 2 box limit. It sounds like the ordering process is tighter and they are adhering to their own rules.
They also easily could have bumped the price $5 or $10 per box and made much more profit based on demand. The prices on ebay from 'flippers' are still astronomical and fetching more than ProVs in some cases. Amazing.