Places I am sure of are Rapid Culture @ Funan and TCG @ POMO.
Here are the other places that should have or soon.
Please note that Comic Connections outlets DO NOT DO exchange.
Singapore-
The Card Geeks
91 Bencoolen Street
Sunshine Plaza #01-77
Singapore 189652
Rapidculture
109 North Bridge Road
Funan DigitaLife Mall #05-18
Singapore 179097
Kurocha
Block 11 Chai Chee Road
#01-17
Singapore 460011
Aniplay
Sunset Way Blk 106
Clementi St 12 #02-40/42
Singapore 120106
Jelly Beanz Trading (Ani-Play)
91 Bencoolen Street
Sunshine Plaza #01-46
Excel convenience store LLP
30 Yishun street 81
#01-04
Singapore 768455
G28 Trading
Blk 822 Tampines Street 81
#01-190
Singapore 520822
Funzcentre
53 Ang Mo Kio Ave 3
AMK HUB #02-08
Funzcentre
181 Orchard Road #05-43/44
Orchard Central
Active Games Collection
Blk 108, Hougang Ave 1
#01-1277
Singapore 530108
Full-Yen Trading
Blk 601 #01-09
Choa Chu Kang Street 62
Singapore 680601
Carito Trading
Serangoon Central Drive
Blk 254A, #01-165
Singapore 551254
TTZ Trading
Blk 804 #01-122 Hougang Central
Singapore 530804
Terabite
1 Pasir Ris Close,
E!Hub Downtown East #04-102
Singapore 519599
Happy House
Nex @Serangoon Central
23 Serangoon Central #04-04
Singapore 556083
Cardmaster Games Singapore
Block 114 Upper Bukit Timah Road,
#03-28
Singapore 588177
Millenium Game World
Blk 166, Bukit Batok West Ave 8,
#01-2600
Singapore 650166
Chak Fung Trading
Blk 810, Hougang Central,
#01-224,
Singapore 530810