The High 5 LCD #1 @ $210 CAD (ie. $160CAD after you subtract the coil), that's pretty much the cost of the parts + shipping if you were to order them from dhgate/ebay/aliexpress.
ie.
- Omron E5CC - $75
- Switch + outlet + fuse socket - $15
- XLR socket - $10
- USB 120v to 5V module - $10
- Aluminum enclosure - $10
- Relay - $10
So that's $130 ... these are just ballpark figures of course and don't include things like wire of course ... in actuality I'm sure it would work out to a bit more as you'd have to get most of the parts from different locations or pay much more than I have listed there.
In other words, even as a DIY I don't think you are going to do it for
much cheaper than the High5 LCD #1 ... I'm sure they are of course getting parts much cheaper, but if building a single unit, you might find it actually more cost/time effective if you want a standard XLR to just swap out the XLR socket on a High5 LCD #1 rather than building the whole thing from scratch
I'm not saying that it's great that High5 has the proprietary pin-out ... however, at least the connector is standard, and at least they offer adapter cables (they can't really change their pinout now, as it's too late, since that would be bad for their existing customer base)