Vietnamese subs aren't particularly cheap, but probably among the most budget items in the area - conveniently located right by Foothills Medical Centre.
Sate chicken and sate beef are both safe sub choices. I can't comment on the other dishes, but based on the constant bustle of people whenever I pop my head in, they must be doing reasonably well.
Unlike home resale values or fine wine, however, these subs don't get better with time. If left alone for a half hour, they will get soggy. Demanding little creatures, aren't they?
$6.50 for one sub.