ydu, Ofcource- As far as I know Grains in bags or in Bins with Scoops(not processed)do not need a hechsher, but they do need to be thoroughly checked for bugs and other things. If Whole Grains are manufactured in a Factory, then the product needs a hechsher. Ofcourse you can purchase all unprocessed Grains and Legumes at the Health Food Store.
1- Do most here buy grains in bags/bins with no Hechsher? (I will ask my Rov, if I hear that the prices are way more reasonable and are available nearby)
2- Are they much cheaper that way?
3- Where in NYC (preferably Brooklyn) is a reasonable place?