Status update: Many online stores (as expected) have informed me that it would be a while till they can get Mudskippers or have added me to their wait-list.
No matter the case, I contacted my local fish store, North Dallas Aquatics, and they said they have no only seen Indian Mudskippers in previous times but also ordered them for other customers. I asked them to put me on their waitlist and waited.
Just yesterday, they asked if I'm still interested and how many I would like. I told them 2 and they said they will place the order soon. Their main policy is that you must pick up the same day it arrives at their store which isn't bad.
If you live in the around the Dallas area, I would recommend checking North Dallas Aquatics as they have a great selection of freshwater, saltwater, and hardware. And, if you ask really nicely, they maybe able to keep an eye out for you. Hope this may help someone out there.