> pokey things and strips

Those do not require a prescription, but they are also not a CGM. They are blood sugar test kits, you can order them on Amazon. You could poke your fingers every hour or 15min to replicate the continuous sampling of a CGM, but that's tedious and makes your fingers sore...

CGMs (in the US) just recently (this year) are allowed to be sold OTC without a prescription, now you can buy them online too.