I got some bulk bath sea salt mix from this place last winter, now they have free shipping, there's so many kinds to choose from... but maybe something will sound interesting..
Bath Salts – Salt Selection Guide
http://www.saltworks.us/salt_info/bath-salt-guide.asp

hmm or maybe I got mine here ..
http://www.sfbsc.com/bath-salts

Amazon & other places have them also.