superrich @ bkk

[pong]

There are actually 3 (THREE) different SR s in BKK, after a quarrel in the Chinese family. Identified by their colours-orange, green and white+blue. GREEN has the (slightly) best rates, all 3 are very close with the others near the BigC on Rajdamri.
ONLY the orange has expanded a lot , In and out of BKk and has dozens of small exchanges, though they all offer shorter opening times and slightly lower rates as the original main HQ. Nothing to worry about.
In that section, which is run by Thai Railways, the otherwise cartel-corrupt same rates for any bank do not apply and there are 6 or 8 small exchanges, SR has the name, but just dont be blind yourself (and the 10000s of Chinese waiting not in line), just check for your currency and take one with no Qs. The big difference is usually for the ASEAN cash currency-I assume you dont have that.
SO the only thing to know is: LOWest floor, RAILLink, just beside.