As a quick guide, in likely eBay fire cameras I believe you'd find:
Raytheon BST 320x240 core in the following:
EEV/Marconi Argus 2, EEV/Marconi Argus 3 (yellow) and ISG K90 but not that easy to split out.
Bullard TI, commander, T4MAX etc (easier to split out)
Raytheon ASi 160x120 in various incarnations
EEV/Marconi Argus 3 (blue) and Bullard T3
Lockheed/BAe cores in various incarnations
Older MSA (eg 4000 series)
FLIR cores
Newer MSA (5000, 6000 series), FLIR
DRS cores
Newer Bullard
Any to add / correct Fraser ?
Bill