I think the internet has done for many of the Chinatown travel agents.

Even Omega Travel seems to be a shadow of it's former self, and now seems to focus only on outbound from China package tours
http://uk.omegatravel.net/
​​​​​They used to have a flight booking engine which was just as functional as Expedia and others.
​​​​​​
Ours Travel which was always more Taiwan focussed still seems to be trading but again is focussed on packages inbound to Taiwan
https://www.ourstravel.com/