Thainatown, on Goulbourn Street near the Masonic Centre has a lunchtime loyalty card!
I went there a twice last week because it was close to where I was. Good food, and not too pricey. always a table or a spot free for a loner. Loved their Duck noodle soup with blood jelly (mmm, offal), and their iced red tea with milk always seems to hit the spot.
Speaking of offal, Suan-i-san, around the corner, sells bbq-style roast liver on a stick. Yummo, iron hit.!