Here are two catalogues for the maths investigation. Click on the links and find different items to subtract from your money amount.

http://www.rebelsport.com.au/catalogue#view=catalogue2&saleId=21062&page=1

http://www.kmart.com.au/catalogue?utm_source=bing&utm_medium=cpc&utm_campaign=Brand%20%7C%20Pure%20Brand%20%7C%20Core%20Terms%20%7C%20Australia%20%7C%20Exact%20%7C%20Search%20%7C%20All%20Audiences&utm_term=kmart%20catalogue&utm_content=Catalogue&gclid=CKCpw-mn_tkCFUQlvAodp-IGhg&gclsrc=ds#view=catalogue2&saleId=21266&page=1