There should be tons of small photo shops doing passport and other photos. Looking at Google maps, I think “photo lab” is an possible search word for these. Around Zhongshan for example you find these. Maybe ask around for prices, they should be cheap by the looks:
I thought we were just having banter. I was kidding about the bonus snark. Actually it wasn’t meant to be snarky at all. I genuinely thought you meant that the BOCA Kaohsiung was used for other purposes besides processing visas which I found strange, and I was just double-checking.
Personally I prefer this old style studio feel with high tech services. They make you look good and give you the right size for each specific need, by email, hard copy, etc.
The Kodak shop where I live charges about $150 if I remember correctly. Comes with 6 photos and a mini cd with the file on it so you can go back for reprints. Next day service or extra $60 for in the hour.