http://www.ebay.com.au/itm/Soda-Blas...ht_1731wt_1398

watch out for things like these.....I saw one go recently for over 500 bucks on ebay. this is a 5 gallon blaster. I just bought a 10 gallon blaster for 168 bucks, and its identical except for the size. they do work well.
sometimes it can be best to bide your time when searching for stuff