Do they sell dried corn husks for tamales?

Yes ,they do

It would be best to call & see if they are in stock....season's vary so they may not have them

For these kind of questions it is often better to call the store itself as they will be better informed to check their inventory for specific items. Even if they did sell an item, it may be out of stock.

Yes

Only to non-gringo, non-English speaking customers. Good luck.