I take my films to Photo-Hobby Limited third floor Silom Complex easily accessed via the BTS "sky-bridge" at Sala Deng. I get good contact sheets from them each with its own plastic sleeve. I've never liked the results from I-Q Lab.
Eddie's shop Camera Collection moved from Silom Galleria some time ago. Here's the new address:
Camera Collection, Channisara Tower/Ground Floor/Surawong Road (just down from Robinson’s Department Store end of Silom Road)
Here's some addresses of other good camera shops:
AV Camera – 1 Soi Keson (Charenkrong 50), Next to Robinson Bangrak, New Road, Bangrak, Bangkok 10500
Foto File Co., Ltd – 1st Floor and 3rd Floor Mahboonkrong Center (MBK), Patumwan, Bangkok 10330