I wasn't aware of the thailandsha website as Michael recommended. I personally used
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because they have great filters, sort and clear price listings, as well as listing the original advertisement brochure of each hotel. I could not find that information on the thialandsha website.
After finding the hotel that had reasonable ASQ/SHA reviews, and that had a price that fit my budget, I contacted them directly via line and everything went smoothly.
So my personal, advice is to use the asq website (or agoda but agoda is pretty shit for this imo) to find the hotel and contact them directly either using google or the thialandsha website that Michael recommended