Another thought on using those industrial totes like the ones on sale at Menards this weekend...
I used the top lid as a better alternative to the standard 10X20 trays for seed starting this year. I started my seeds in 4 inch net cups, and my 10X20 trays were not really strong enough for me to pick up the tray and move it around. the 10X20 trays I had were made with cheap plastic. These tote lids are much, much stronger. Also, one of my 10X20 trays had a crack in it so it could not hold water for bottom watering the pots. I did not want to buy another cheap 10X20 tray for $3.00, at the time,
When I was done with my seeds starts, I washed off the lid and packed up my supplies in the tote for storage until next year.
At my Menards, people often purchase the totes without taking the lids. Our store had an excess of lids without totes to go with them. One time a manager just gave me some lids for free, another time a manager sold them for a small cost. Still, cheaper than buying a standard 10X20 tray at the store.

Once again, our Menards has more lids than totes. The last two totes I purchased I put an extra lid in the cart each time. The checkout ladies never bothered to check so it must not be a big deal for them. Also, there is no barcode to scan on the lids, only the totes. In any case, they still have more lids than totes in the store. Frankly, if someone pays for the tote and does not take the lid, then the store is not losing any money if you throw in an extra lid. It was already purchased by a customer.

I talked to a manager about his big stack of leftover lids when the totes were all sold out. He stated that lots of people are using the totes for deck planters. But the totes cost about $12 (regular price) whereas a garden "planter" of the same size is about $30. So, lots of customers just buy the totes without taking the lids. That manager just gave me a couple extra lids for free. But it all depends on who you ask.