DEWALT 5/16-in-18 2-Flute M2 HSS Tap with Drill Bit $2.09
https://www.lowes.com/pd/DEWALT-5.../999959789
DEWALT 1/4-in-20 2-Flute M2 HSS Tap with Drill Bit $1.49
https://www.lowes.com/pd/DEWALT-1.../999959793
Drills and taps hole in 1 application
Deburr and countersink in 1 step
Hex shank - designed for impact drivers
Speed tip - drills material quickly
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I didn't really want the expense of a full tap set at this time, so I got these (I got a set of 5, but they were dewalts and cost me $30). It worked like a damn charm.
I'm sure if you are tapping a lot of stuff and probably thicker material, you should use a traditional tap set, but for the 1/8" material I did, it was great. I don't have experience with any other thicknesses, but I"m gonna pick some more up at this price (esp 1/4-20) becaause I think for a quick job it works great, but I think they might be a bit fragile (though mine haven't broken yet)
Edit: this was only for the 1 1/4-20 I tried to buy. They were not available for ship to store or delivery. the 2 5/16-18 I got are still on order with ship to store.
I've got another brand of these drill/taps and typically use them to chase bad threads, or to re-tap electrical boxes that have stripped out #6 threads with a #8 thread instead. They work great for that. If making a new hole in something hard, I recommend a pilot hole first to get rid of the bulk of material and take it easy. But they do work well.
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I'm sure we did everything wrong with it, but it got the job done.