Where can i find them in Thailand stores? please....thomas

Foodland usually have split peas, yellow, green lentils, dried beans etc.

As you enter in Patt's store far right alley at the end on the left hand shelves, at the bottom..

Definitely Foodland. McGarrett (I think that's an Australian brand, but the peas are from the US). About 45 Baht for 500 grams. Do check the production date on the pack. Some packs are very old, and the peas just don't go soft however long you boil them.

Any major supermarket.