DK Books is here, among other places:
D.K. Today Co.,Ltd. -- บริษัท ดวงกมลสมัย จำกัด -- Your BEST source for English Language Teaching books. - Map
I'll give YOU money if they're out of stock of either book.
Easy to get to, just north of the Indra Hotel, on a dead-end soi next to the
airport train tracks. Has everything you could possibly need.
Or, if you want to buy both books off me at slightly inflated prices or at cover price + beer,
just let me know.