In case anyone is curious, the difference in price of 10 months and 30 book boxes is $100, with the group I used last time. So, I must get another bid to compare, and see how much I can move myself this week.
Do not believe the people at Uhaul.com when they say that a location has moving supplies in stock.
They lie.
The locations do not maintain that portion of the web site -- U-Haul does. So U-Haul knows what was shipped to that location, but not what is currently in stock.