AcuCheck glucometer and strips
yes, those i saw today in a few stores, though only 2 stores had more than one box on the shelf. and ifwanting to start over, i think 3000 for the kit, meter/strips to get started, then more strips, which i didn't notice pricing.
but OP already has a system, which apparently isn't available in udon. when i talk about online sites, ones i noticed were in usa, where op is, and not sure if ship to thailand, or would be worth the extra shipping. even though can by OTC, still a medical product and import/export may be restricted.
just do a google search, and you'll come up with plenty of sites selling. with shipping and insurance info, if covered. good luck all.
i checked the lotus/old one, boots/watson/pharmacist on 2nd floor of complex, and one across from udon hosp, had a lot, just not bayer. also a local shop that supplies many other shops in udon and beyond, Ree's sis is a pharmacist in NBLP, she buys a lot there, but they also had no bayer products, recommending the 3 shops by the hospital, more than the one i checked, but on a time schedule, so didn't bother with other 2 shops over there.