dont know the cheapest - but the best ist Gigabyte AB-350 Gaming 3
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I do love that board as well - it's a bit expensive compared to the other options, but well worth it. Stable, especially with current AGESA updates and can handle a decent amount of OC'ing without taxing the VRMs etc too much.
I use it in HTPC set up and left the CPU at default settings; any OC'ing is handled dynamically with Ryzen Master. In my case, I decided on this board because of the WiFi option which is nice to move this around without having to worry about CAT/network cables and it's good enough for streaming video/audio without any lag.