Donut and jumper
If you need 180 inverted SNOT this is the thinnest technique out there. It's a real gem.
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.
Its symmetry makes it very useful.
This photo by Brian shows another useful trait: you can rotate the technique for some fun results.