Donut and jumper
If you need 180 inverted SNOT this is the thinnest technique out there. It's a real gem. It's a relatively new technique since the donut was first released in 2013.
To find the different pieces needed for this technique you can search LEGO's online Pick-a-Brick for the design ID's. We link other market places directly on each individual piece page, which you can find below.
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Its symmetry makes it very useful.
This photo by Brian shows another useful trait: you can rotate the technique for some fun results.