Lao Bao is in Hướng Hóa. Small and pleasant town on the Vietnam-Laos border. Famous as appropriate border-crossing point in central Vietnam. Cross to Dansavan on the Lao side where onwards travel into Laos is possible.
Cross Vietnam-Lao border. Procedure is very easy and calm due to low passenger flow. Though, you can still meet a couple of barangs there.
Small Duty free shop has prices in THB, but seems to accept every currency.
We saw a few hotels in there through the window of our bus, but didn't stay.
Bus to Dong Ha costs only 50k dong, but be ready to be asked for 100k+. The driver must have a laminated paper (usually hidden under his seat) with real prices. Also it may take additional hour to gather all other locals, their packages and stuff around the town.