I have a number of garden wagons and tow-behind the riding mower trailers. This spring, I had 5 flat tires to repair/replace. One of my garden wagons had all 4 tires flat, so I got a set of 4 inner tubes from Amazon and put them in a few days ago. That pack of 4 inner tubes set me back $22.00. Locally, they were $9 each. I hope those inner tubes will last longer than the previous ones. In general, I'm not too happy with any of the inner tubes I have purchased in the last few years. They all seem to be of poor quality and I am lucky to get a full season out of them.
Today, I replaced a tire on one of my tow-behind trailers with a more expensive no-flat tire. You know, the solid filled tire that has no inner tube. The inner tube for that tire was $15, but I opted for the $38 no-flat tire and just be done with blowing inner tubes on that trailer. In theory, the no-flat tire should pay for itself in 2 years - assuming I would continue to blow all these inner tubes every year.
Not too exciting, but it's nice to have all my wagons and trailers back in service and ready to go. Where I live, we plant our gardens more or less on Memorial weekend. So, I'm actually ahead of schedule on some things.