Ikea has some as far as I can recall.
Also try these punters.
http://www.chilloutloungehk.com/
Headquarters
Shop 226, 2 /F,
Winning Commercial Building,
46- 48 Hillwood road, TST, Kowloon,
HK, China
Monday - Friday 3-8 pm
Saturday 1-8 pm
Sunday off
T (852) 8100 0355
F (852) 24724811
and
Unit 09, 19/F., Paul Y. Centre
51 Hung To Road, Kwun Tong
Kowloon, Hong Kong
Telephone: +852-2511 6382
Fax: +852-2507 5405
(They seem to make promotional bean bags).
We did see some in Lumpini Nighmarket in BKK.. too bulky to carry back to HK.
