Good job... I haven't found anything I wanted or needed. I've looked several times.
So, when you do search for something on amazon, there's two ways to find cheap crap.
One is to use the condition filter or seller filter. The used condition filter or seller filter for "amazon warehouse" will bring up returned or open box items.
Thw second is to search for something, then after yiu search, paste this to the end of the URL and hit enter/go:
&pct-off=70-&sort=price-asc-rank
The number is percent discount. Change it to your liking.
It's covered pretty well here:
Use These Simple Amazon Hacks to Get 70% off or More on Amazon Warehouse Deals for Gently Used, Like New and Open Box Items.
www.wallethackers.com
Also, I always use Honey (browser extension) when shopping Amazon, and will verify price on camelcamelcamel.