I kept calling my local Costco's (local is a relative term, the closest is 70 miles away). Apparently the Midwest will not receive the beer advent calendars, so yesterday my DH and I drove to St. Louis to look for an appropriate box at The Container Store. Nothing worked that was reasonable. I found a cute one on ETSY, but they were $35 each and we are doing 3. We ultimately found a box that would work on Uline, and we have to order 10, so we will have a 3 year supply. We also went to Trader Joe's and World Market and were able to get all of the beers we needed (both allow you to mix 6 packs). I determined the cost will be approximately $48 each. Since our DD goes to college in MO, we also picked up the first 15 days of lottery tickets from there so she could redeem them there also.
So now, I just need to order the boxes from Uline, and start saving toilet paper holders (changed my mind about how I am going to do her lottery advent), and pick up either some numbers (for the beer bottles) or tags. Since I can't completely hide the beers, they will be individually wrapped, so that will also start soon.
I feel I have a good handle on things.