Good work Carl.
On topic, most times on-line is cheaper than store front but If the owner knows more about his stock than you do and doesn't feed you BS it can be worth the trip.
I bought my false bottom from my local as I could physically try it in my mash tun.
Well stored yeast and hops is...
I would stick with the fridge to freezer thermostat you put in the first post.
I have the same one in my F&P keezer and have had no problems, very easy to install, no extra wiring and just set and forget.
I have an STC-1000 on one of my fermenting fridge and find the temp probe inaccurate by a...
Phosphoric sanitiser (Starsan) can be re-used if pH is below 3, it should be free from debris as you only use after cleaning for sanitising.
High pH cleaners such as sodium percarbonate may have debris from cleaning and sodium percarbonate breaks down quickly.