Prescription mask for snorkelling?

I’m off to Koh Tao in a few weeks as part of my travelling in Asia. I’m coming back through to Bangkok from Cambodia for a week before heading to Koh Tao.

I wanted to do some snorkelling whilst I was there but I wear glasses. My prescription is -5.25/-4.75. Contacts aren’t an option for me.

Does anyone know how I go about sorting out a prescription mask? Is this something I could acquire on Koh Tao or something I’d have to buy in Bangkok? What sort of prices would they be and would they need to be sent off to be made, and for how long? All general advice appreciated, thanks.

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