The one that SRA gave you doesn't have TD available.
Here is a bulk supplier in Victoria http://www.awo.com.au/titanium-diox...MIxqyi7buB2wIVjjUrCh2ZJAjkEAAYASAAEgIygvD_BwE
1 kg is $33 5kgs is $137.50
Anytime you want to find a supplier do a google search. All I did was - Bulk supplier of titanium dioxide in Victoria Australia and it came up. Easy.