For small amounts, I use the Kyocera hand held adjustable mandoline. It has a ceramic blade and lasts a very long time, years with the use it gets with the 2 of us.
There are 2 models, 1 adjustable and 1 fixed. I have used the #1 setting to slice truffles. The #4 setting is still pretty thin, but I use it make scalloped potatoes.
I've bought the Kyocera at Sur La Table and off Amazon. Low to mid $20s depending on whether you get fixed or adjustable.
I don't use the guard, but get it down pretty far. If it's something I want to use every bit of, I put the flat cut side down on the cutting board and slice thinly from there. If it's an onion, I take it down as far as I'm comfortable, then slice in 2 or 3 slices, chop and bag to put in refrigerator for another dish.