New Snap-On Tools
New still sealed metric box end set. 10-20mm. XDHFM606. Bought some months ago and never opened. Price includes shipping. Paypal or USPS M/O.
$200 shipped
New Sealed Snap-On flank drive plus metric wrench set. 10pc 10-19mm.
$200 shipped
Maybe just a bad batch. I traded my ct7850 months ago for a milwaukee. I have been more than pleased with mine. By the way I also just bought the bare tool.
You could maybe get away with buying the socket set and renting the tools from your autoparts store. Brakes aren't that big of a deal. The ac is where you might do some research and see if your up for the task.
Start with a craftsman mechanics tools set that has 1/4,3/8 & 1/2 drive sockets and ratchets. But of course I would wait until said item is on sale. Then fill the gaps and extra hand tools from HF.
Busted a cheap 3/8 ratchet and cut my knuckles in the process. Bought a 154pc craftsman set. It made a huge difference. Also first time I had all my sockets and wrenches organized in blow molded case and not just in a box thrown in.
If you don't want to confront any of your co-workers, just lock all your tools, including your cheap ones. Now if they ask to borrow something, then that's up to you. At least you will know who has that specific tool while loaned out.