Very nice variety of raised beds. I am assuming they are metal and came in kits?
As to the old wheelbarrow... I would suggest looking into getting a four wheeled Gorilla type cart instead of a wheelbarrow.
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Gorilla is a big name brand, but other companies also sell these carts. You can get them in various sizes. You can easily move a much heavier load with these four-wheeled carts. It's also much safer as you don't have to wrench your back trying not to tip over the one-wheeled wheelbarrow. My four-wheeled carts all have the handle that switches between manual pull mode to hitch mode for towing behind the riding lawn mower. That makes it super easy to move really heavy loads anywhere on my property.
The four-wheeled carts cost a bit more than a typical wheelbarrow, but IMHO, they are worth it. You can just do so much more with the carts than a wheelbarrow.
Having said that, when I was younger, I only had a wheelbarrow and that worked fine for most of my needs. You can get a parts kits for wheelbarrow rebuilds at Menards. They have different sized kits depending on the size of your wheelbarrow. That would probably be the least expensive route to get you back up and running.
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Although I now have a number of four-wheeled carts that I use all the time, I also repaired my good old wheelbarrow as well. I got one of those parts kits on sale for about $20.00 a couple years ago. I don't use my wheelbarrow much anymore, but sometimes it is the better option for a particular job.