I found this interest article on The Mercury newspaper site regarding the cost of a wedding.
Here is an extract from the article but note that some items such as the cost of Celebrant/Minister are missing and the cost of the rings seem rather low to me.
WEDDING COSTS
State, Low, High, Average
TAS, $11,000, $20,000, $15,750
QLD, $3000, $50,000, $20,251
NT, $11,000, $30,000, $22,000
SA, $5000, $45,000, $22,111
VIC, $7000, $60,000, $26,295
ACT, $12,000, $60,000, $28,700
NSW, $6000, $130,000, $29,331
WA, $5000, $65,000, $29,794
Source: Truebride.com.au
PHOTOGRAPHY: $3320
RINGS: $450
RECEPTION: $11,219
BEAUTY: $828
GIFTS: $326
FLOWERS: $1041
HONEYMOON: $5600
CEREMONY: $950
CARS: $675
BRIDE’S ATTIRE: $2330
GROOM’S ATTIRE: $282
STATIONERY: $675
MISCELLANEOUS: $450
The average Australian wedding costs $28,146, according to Truebride.com.au
– Peter