Knowing what I have learned from selling thousands of used Snap-on tools on eBay, if I was starting out as a new tech, there's only one way to go:
Save up about $6-8k and buy a Snap-on triple bank packed with high end tools. You will pay 15-20% of list price for the package.
Seach Craig's List with a 400 mile radius. Be patient, and you will find the right motivated seller with the right tools. There are guys that have had their boxes for 30 years, and others who have five year old pristine boxes. Some techs wax their toolboxes once per week. But no matter how well a tech cares for their tools, for a variety of reasons, sometimes they want to leave the business. (Sometimes it's not their choice, as turning wrenches is very hard work an can lead to physical problems.) If you are patient, you will find the right seller that has a box you like, and has kept his tools complete, organized, and in good condition.
Once you find the right tool collection, rent a U-haul ramp trailer, and go get it. Even if you have to drive a long distance, it's worth it for a purchase like this. On a $6k loaded box, you could save $30k or more. And bring about a dozen plastic bins; you'll need to unload the box before loading it on a U-haul. (Put the tools in the tow vehicle). Those 5x9 ramp trailers can't hold much more weight than an empty triple bank.