RV travel · Latvia

Hi fellow travelers, I’m currently traveling around Europe and passing through the Baltic countries. My camper van is equipped with propane gas bottles for heating and the fridge. I still have a Swiss bottle left, and so far I’ve bought a new bottle in each country I’ve visited and returned it when leaving. In Lithuania, it seems complicated to get a new propane bottle (I’ve tried hardware stores and gas stations), but I’ve been told they don’t even exist here. In Switzerland, it’s illegal to refill bottles. Does anyone have info on where and how to buy a new, full propane gas bottle? I don’t have LPG installations in my camper van. Thanks for the tips! !