I came across this KX2 paddle from the QRPGuys recently. The price was right at USD 25.00, postage was USD 5.00, so quite a bit cheaper than the original one. It’s made from soldered PCB material so it won’t be as robust, but it seems to work just fine so far.
It took about a week to arrive from ordering, I understand that they do their mailing on a Wednesday.
The instructions downloaded from the website were clear and straightforward, construction took about an hour. Right at the start, it’s important to line up the PCB rear and sides nice and square before tacking together with solder. Apart from that, the only fiddly bit was getting the screws, washers and spacers in place to hold the paddles in place.
At first it felt a but strange to use with the flexible paddles, but you get used to it pretty quickly.
It probably needs a cover for the paddles when it’s not in use to protect it from backpack rash.
For the moment, it is wrapped in some EPE foam.