Your post points out why I never buy anything from PF. You can get 4 oz (120 g) of tartaric acid from www.chemistrystore.com for $2.59 and 8 oz for $4.95 plus shipping.
For sodium chloride use pickling salt which is very cheap.
The common name for sodium sulfate is Glauber's salt. You may be able to get it thru a pharmacy or a feed store. It is used as a laxative for humans and animals.