If you are here for a few days---look at Lazada, -I can see in the photo above a 1,300 baht suitcase I brought last week for 560 from Lazada.....Shopee also is doing a sale many things half price.
Edit.---if you are not staying for long---make sure it comes from a Thailand distributor.....The suitcase I got was distributed fro BKK wholesale got to issan about 38 hours after ordering.