Most every item shipped from Amazon is available unless internationally unless restricted by the manufacturer (ie some western Arai motorcycle helmets).
Items shipped directly from the seller and not stocked by Amazon are usually not available, as the seller doesn’t care to deal with the hassle of international shipping and customs headaches.
I have almost always been able to find a seller that is available.
You can’t analyze a $100 USD transfer and conclude that one service is better than the others for all or even most transactions.
Due to per transaction fees and sliding scale rates, etc., the only way to do a proper comparison is to use the actual amount you intend to transfer monthly or annually, etc.
For very large transactions, a bank to bank international wire transfer may be the best choice, especially if you go to the receiving bank and negotiate a better exchange rate.
For medium size transactions, Wise may, in fact be the best choice.
For small amounts (and there is really no good reason to withdraw small amounts as it’s very costly) a debit card transaction at the teller counter with a no fee debit card may be optimal.
If you are really smart you will go into Wise and automate your annual transfer when the exchange rate reaches ฿37 or even ฿38 to $1 USD (or whatever you prefer).