A Wheel Barrow is cheaper than a large tool box, and it rolls better on grass.
Funny story:
When I got out of the Army I had to wait a whole semester before I could start going back to college. I grew up in my Dad and uncles car repair shop. I got a mechanics job in a big truck shop. There were huge, long bays with two very long and strong steel work benches for each mechanic. There was an old guy(I was only 21, so most everyone seemed old to me) who specialized in overhauling 10 speed Road Ranger transmissions.
He did not own a tool box. He kept his tools in two five gallon buckets which were steel in those days. At the end of the day he raked the tools in the buckets and they got locked in the tool room at night. The next morning he dumped out two piles of tools on one of his huge work benches. As the morning went along, the two piles became organized rows of tools. He then used the buckets to hold the parts he separated when he disassembled a transmission, reusable parts in one and bad parts in the other. He would take his bad parts to the parts counter and would pick up each one, look at it and tell them what he needed, one part at a time. The guy was a magician with those gear boxes.
Snap On made only a few different tool boxes at the time, and I think about the biggest set they had was about a thousand dollars which was an enormous amount of money in 1971. I’ve observed over the years that most of those five thousand plus dollar tool boxes ar either near empty or filled with junky tools. Occasionally you’ll find a nice box stuffed with Snapon tools.
Another story:
My brother in law was a mechanic all his life. He was smart enough he could probably have gone to medical school, but he just liked twisting bolts. When I met him, he had a large for the time hardware store MBC top and bottom chest. When you opened any drawer it was PACKED with Snap On tools. As the years went by, and the tool box took on quite a patina, his tool box was sort of a laughing stock, but when someone made a comment he would tell them to open any drawer. When they did, they usually stopped laughing and closed the drawer.
He worked his last 25 years or so in a high end Mercedes dealer, and the snobs put him in the back of the shop because they didn’t want their customers to see his ancient tool box. Not long before he retired, he got the last laugh. The dealer moved into an incredibly high end facility and decided to provide huge, nice stainless steel tool boxes for all the techs. Sweet justice.
To the OP:
Buy a sturdy, less expensive tool box, then go online and find some really good nylon casters and put them on before you load the box with tools. I used to do this with Craftsman boxes, but Home Depot boxes seem to be a decent, lesser expensive choice.
Buy decent tools, but they don’t have to be Snap On except for the things you like. I like Snapon combination wrenches, their ratchets and their swivel extensions. There are a few other Snap On tools I’ve gotten such as their unique swivel ratchet and their wrist ratchet, but there’s no need to fill a box with Snap Ons.