Sigma-Aldrich provides excellent quality Sodium Dichloroacetate, but it will take a long time to acquire their product and will cost significantly more compared to other suppliers.
PureDCA is a quite expensive Sodium Dichloroacetate vendor. The DCA they sell is good quality, yet it doesn’t match advertised parameters due to high amount of moisture in their product.
PharmaDCA provides decent prices and great product options, the quality of their product does not match advertised parameters, but is good to use nonetheless.