That was a nice little touch with Dahons. Unfortunately the Tern folders ( what has replaced Dahon) doesn't have them.
I got some from Kathmandu a few years ago.
You can get any more from Dpti or MAC (no matter how many people you call or beg or try to say how you are helping ppl!)
I reckon they'd be available at novality shops or others that have been mentioned
I got one from BISA a few years ago; from a non-cyclist about 18 months ago advertising her company; and another one 3-6 months ago from somewhere else. So they are about, in different colours (silver, yellow) and wording. Gave my spare ones to another cyclist.
I think I saw some in Kathmandu last week
Last Tues (not yesterday) I was riding down NE Rd Valley View on my way back from Williamston around 1745 and there were about 30 of them lying in the gutter. On the little hill just before Grand Junction Rd. My ay-ups were lighting them up and I stopped and picked a few up. There were advertising a facebook page. I dont know if there are any still there.
I've gotten silver reflective ones from target for $5 a pair in the past. also
maybe Adelaide Cyclists branded??