Any brushed DC motor that is series wound (the field and armature are in series, with terminals that say A1, A2, S1, S2) within the voltage window of the controller will work.
If it needs to be in China I recommend browsing through sites like this one:
http://www.globalsources.com/gsol/G...int_id=3000000149681&catalog_id=2000000003844
If it needs to be in China I recommend browsing through sites like this one:
http://www.globalsources.com/gsol/G...int_id=3000000149681&catalog_id=2000000003844