How can I extend my 30-day stamp in Thailand without applying for a visa?

A user seeks advice on extending their 30-day entry stamp in Thailand. They are considering crossing the border into Cambodia by car to obtain another stamp. Key queries include the cost and required documents for the process, the possibility of obtaining the stamp without an overnight stay, and whether the new stamp will extend their stay by 14 or 30 days. Responses indicate that the user can alternatively visit an immigration office to pay 1900 baht for a 30-day extension without leaving the country, while also noting that re-entering Thailand via land for another stamp is limited to two times per calendar year.