Besides that there is NOW Foods brand as well. The malto is called "carbogain" and the dextrose is, well called "dextrose"
They have that at bulknutrition.com and a number of other places. BB.com as well but I boycott their asses.
Nutraplanet has some prodcuts as well I'm pretty sure (nutraplanet.com).
ProteinFactory has a lot of carb products including malto and dex.