Building/property inspection fee in Melbourne?

Hi guys, 

I just want to know the average building inspection cost for a townhouse and the difference between building inspection and property inspection.

I have two choices at the moment (1. Get Archicentre to check 2. A private architect who can do the inspection for cheaper (inc. official documents)) and  I need to get some cracks checked but not sure how much I should pay and who to contact.

Also, I'd like to know if the building inspectors do property depreciation report (for tax) as well. 

Any advices will be appreciated. 

Thanks!