Hi try the plant souk - they have hundreds of plant pots all shapes and sizes. The prices are very cheap too. Directions are on the link below - its near the sewerage treatment plant.
http://www.expatwoman.com/forum/messages.aspx?TopicID=75714[u'>[/u'>
cheaper again, and a huge range can be had at the plant souk at Warsan.
Take Hatta road past dragon Mart. Turn right at the next big roundabout and left at the next one (follow sign for Warsan) You will see all the nursery plots out there....they have everything garden related at great (for dubai) prices.
Ikea are very reasonable also the plant place by union co-op by Dubai College has the terracotta pots. Carrefour also have a few ceramic plant pots but not a huge range.