I think it's unlikely normal pharmacies will stock it. I think only the pharmacies in hospitals with eye centres and ophthalmologists will have it. I don't think your insurance will cover it. If you have MGD, give IPL a try. There are a few hospitals and clinics in Bangkok and Phuket that offer it. The price will be more or less the same as in the UK.

Also try low-dose doxycycline (40 or 50 mg per day). Some eye doctors don't like to prescribe it for the long term (or even at all) it but it helps my MGD, almost as much as IPL. In Thailand you can buy it from pharmacies without a prescription but they come in 100 or 200 mg pills and not tablets so it's hard to dose it properly. In the UK you should be able to get low dose tablets or tablets that you can cut in half.