These days it has become trend to buy and sell amulets all over Thailand and even in online stores. Even there are rent method where you can keep buddha images with you for rent. It’s not right to use the terms cheap or expensive because that’s not how we can judge amulets. You can see lots of ads for amulets in magazines, websites, tv shows, in YouTube channels.
Amulets are like watch, wine or jewelry what I mean is, they are at some point. Just like that certain amulet are also very rare & those will be taken for rent but it will be expensive. However, you will get some basic amulets if you visit temples for almost free of cost. Do some donation of groceries and food for temple and you will get amulets as a gift in return.
However if you want to have the real Thai Amulets, you need to have it from reliable sources like LP Toh Wat PRadoochimplee from https://thaiamulets888.com/lp-toh-wat-pradoochimplee/ and they do not come cheap as they are result of many years work.
There are scam going on even in temples I don’t say this happens in all the temples of Thailand but in some I have seen. During vacations I go far all temples visit in Thailand so there some big and famous temple in Thailand, scam they do is they take the groceries from donators and sell it some shops which are temples backside. This I have seen happening multiple times in famous temples, I don’t say this is happening in all the famous temples of Thailand, but it is in few. The only problem I find with this is there are many small temples in village of Thailand where they are struggles to fulfill basic needs. People can visit those temples and do donation there even they are temples.
We decided to donation things to these village temples and help in whatever the possible ways we can. In this process head monk of that temple gifted us many amulets and that’s the reason me and my wife has Thai amulets in our car, well they are usual pressed clay amulets.
I have one more amulet its jade buddha images amulet I bought it from Chiang Mai city when I went for mountain visit. This I went to buy jade larger buddha images for my mother who was ill terminally that time. But I got only smaller Thai amulets and I made it wearable by putting into chain. In case if you want to buy large number of amulets for less price then you will have to visit markets in Thailand. So, these are the places where you are can get amulets.