Can I obtain a 7-day stamp from Thai immigration after my Non-B visa expires?

Hello.

Please can you advise: I have been working in Thailand on a non-b visa for 2 years (teaching) it expires later this month the day I finish work with my employer.

1) Is it possible to apply for / get a 7 day stamp from an immigration office to allow me some days to organise leaving the country?

2) Would I have to go and ask for that the day my visa expires or can it be done in advance?

3) Do you know the cost of this?

Thanks for your help.