Oh no, I'm talking about a visa run to Myanmar, checking for yourself, I already did it twice and know some people that did 8 times already. It 2300 the though each run. Depends on your nationality
Nok air at one point had a shuttle from the udon thani airport to the center in Vientiane and yes it stops at the border and you reboard the bus after you clear immigration. You can book in I believe on nok air website