I did grab one of the 8bitdo Sega-style 6 button bluetooth controllers for $20, though.
Ooooo, that's a good get. I have one of those pads, and it's one of my favorite ways to play older games on my switch. The slightly mushier round D-Pad has that great classic Sega feel. That combined with the 6-button layout makes it a fantastic fighting-game pad.
I passed on the aracde stick as well. Partially because I have the original 8-bitdo arcade stick. I will likely eventually get the new, upgraded arcade stick, the 2.4 Ghz support for it is very tempting. But I'll likely wait until after the Analogue Duo comes out.
The gaming deals for Prime day have been hit and miss, and mainly miss. Not very steep discounts, and what has been there has been sparse. Some of the smaller publishers seem to be getting into it at least. I picked up a copy of CrossCode from Inin, and they have another game going up for sale later today. I had to settle for the PS4 version of CrossCode, as the Switch version had already sold out.