Ordering in the US - ICOP has an office in California and manufactures its stuff from Taiwan. My 2 SoMs cost 177 USD (back in May/June of this year) without shipping each, but be warned that you MUST also get mating pin connectors that are no listed on their website. You have to specifically mention them in your forced email communication with them. They are 4x ICOP SOM304 SX/RD/MX+/DX2/DX3 Dev Board Mating Connector" PH2*38(1.27)-5.3MM.
Also, don't fall into the same trap I did and do not get the circuitmaker listed 16.000 MHz crystal for the sound chip. Get the vintage-friendly 16.9344 MHz. Both will make adlib and sound blaster sounds work well, but the former will make MIDI completely fail.
I also ordered from PCBWay and I kinda regret not controlling the thickness of the front and back plates. It's too thick and causes issues when inserting/removing the microsd card. You have to really jam your fingernail in the slot and you risk damaging the microSD connector (which I did, twice). So, the only way to safely change the microSD card is to unscrew the front plate and use minimal force. If I had thinner plates, like it seems Andy has in his videos, all of this problem would be removed I bet.
If I had to order more (I don't, I used 2 plates and gave out 2 to a local DIYer who also made his own 2 units), I'd check out JLCPCB because a cursory check a few months ago indicated that they'd be quite cheaper. It may have changed, but it's worth consulting and comparing the prices.