Well, it is really difficult to find the price of something online in Thailand. The vendors usually don't have online presence in Thailand. If they ever have a website, they are usually poorly designed and lack any online purchase function. But I recently found a website from Hardware House, a reputable Thai computer and accessories vendor. Although they don't sell things online, they have a list of their available products with price list. You can find many Hardware House vendor shops at Panthip Plaza in Bangkok.