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Any decent hobby or model railway store should stock it also.
You could also try some of these (I know a few people up in Brisvegas who make models for a living).

Irresistable Force: Gaming store based in Brisbane. Also have an online store. Wide range of products, including an extensive scenery and terrain selection.
Retail Store: Shop A,
147 Bryants Rd
Shailer Park 4128
Open: Monday, Tuesday, Wednesday, (10am-5pm);
Thursday (10am - 9:30pm);
Friday (10am - 10pm)
Saturday (10am - 4pm)
http://www.irresistibleforce.com.au

http://www.irresistibleforce.com.au/catalo...astics,206.aspx

WarPuppy
Miniatures, Games & Hobby House
PO Box 3036
Newmarket 4051
Queensland Australia
E: sales@warpuppy.com
Live Messenger: sales@warpuppy.com
http://www.warpuppy.com/

http://www.warpuppy.com/Scenery-&-Scat..._162/index.html

Hobby One Evergreen Styrene stockist
3/489 Creek Rd
Mt Gravatt East QLD 4122
(07) 3343 8655
http://www.hobbyone.com.au/

Hobbyrama Evergreen and limited Plastistruct stockist
480 Stafford Rd
Stafford QLD 4053
(07) 3352 3333
Monday-Friday: 9am to 5:30pm
Saturday: 9am to 4pm
Sunday: 10am to 3pm
http://www.hobbyrama.com.au/

H.E. Supplies Pty Ltd large range of various plastic rod and sheeting
186 Wecker Road,
Mansfield,
Queensland,
Australia, 4122
Shop Hours: 9:00am to 5:00pm Monday to Friday
Closed Weekends and Public Holidays
Phone:07 3216 8166
Fax 07 3349 1400
sales@hobbyparts.com.au
http://www.hobbyparts.com.au/