Pert,
The price must have just come down from about $4. Now it is $2
One year ago I bought 100 P-au at $2.7 each, that's 100. Most people don't need that many.
Now it is half the price. Still, even before the price came down, the nanos were at $3-3.5.
Anyway, most makers aren't going to compete with spar-dafruit. Here is one solution I found that may suit others as well:
Don't hate/fear the cheap stuff on the internet, use them! I used to build boards like this (both sides need reflow, only showing one side):
This is what I do now:
I am using all these cheap modules in a thru-hole design. This is an open-source data logger so is the previous one. On the outside they look the same:
