Following on from Something from nothing, progress was sporadic/slow. After 5 months of trawling second hand markets in BKK, I ended up with 5 drives, two of which, although not being the same brand, look suspiciously identical.
LG IDE DVD drive
Generic SATA DVD drive
Generic SATA DVD drive, but different from drive #2
ASUS SATA DVD drive (same as drive #5)
LG SATA DVD drive (same as drive #4)