So which is the best border run now from Bangkok? I mean cheapest and fastest for a Spanish passport, is there any company now offering that services?
TLDR : Answer Summary
The best and cheapest border run from Bangkok for Spanish passport holders is to the Kanchanaburi/Myanmar border. A recommended service for this is provided by thaivisaservice.com. When doing it yourself, the total cost is around 1,140 THB, which includes transportation and the border crossing fee.