Hi @Bill_Donnelly I bought mine from this U.K. seller on eBay…
But this seller might prove more economical for you as they are based in China. They also list the various brackets and also a version of the sensor cover that has a solar panel on top…
The cover is actually designed to house the main processing unit for the weather station, so doesn’t mount directly on to the brackets. I just made a circular plastic plate to go in the bottom of the housing, with a square hole to allow it to fit onto the bracket.
I also found that horizontal rain will make it through the slots in the tube and on to the sensor, so some additional protection is needed within the tube, and it’s a good idea to cover the BME280 board with varnish (all except the tiny sensor with the hole in it).
Pete.