You can purchase platform wedges from nearly any store that sells shoes. For low prices, consider buying them used from a thrift store or Ebay; a discount store such as Payless; or a mass merchandiser with a shoe section, such as Walmart or Kmart.
Platform wedges will always be in fashion, especially in the summer. Top fashion labels like Alexander McQueen and Steve Madden have platform wedges in their 2011 collections. The style of Lady Gaga has also contributed to the popularity of creative platform wedges.