Total cost of a 30-day extension?

What is the total cost of a 30-day extension to a 60-day tourist visa [from the Nong Khai Imm. office], please?

It's been a while since I've done this and people tell me that there has been an increase.

Last time I had that done was in July 2009 Fred - so not sure if it has changed from then, but was 1,900 baht for the extension. I did not photocopy the pages of my passport so they did it for me & I think I paid about 20 baht for that - from memory....could have been 10 baht though..