unfortunately platinum usually has a really high premium and are usually only available in dealers. I rarely see threads offering to sell platinum and palladium at decent prices.
Here's a 1997 koala 1.9oz set at a decent price from US dealer for anyone interested. Price listed doesn't automatically adjust to spot so might have to send email to double check price. http://www.coinvault.com/a-e.htm
Can't imagine platinum getting any cheaper in the short-term. Anglo American Platinum says it lost $715M in 2012 http://www.keyc.tv/story/20954413/anglo-american-platinum-says-it-lost-715m-in-2012