I can get a 30-day extension, right?

Yes, on a tourist visa you can get an extension for 30 days. Costs 1,900 baht. Do it in the last week of your stay.

I can get a 30-day extension, right?

Yes. 30 days. 1,900 Baht Fee. You can apply a few days early. Here is the form. You will need a passport size photo.

Yes ^^^, assuming of course that our OP really has a Tourist Visa (from an embassy) and not a visa exemption stamp which so many call a tourist visa

I can get a 30-day extension, right?

Answered above.

BTW How did you get on with your 12 month extension or did you give up?

I got my tourist visa in Vientiane. I've not given up on my non-imm O, but have become pretty discouraged about it. Especially after the wasted trip to Bangkok! I may just keep doing extensions and border runs until we go back to the states on May 6, then apply for non-imm O from USA prior to returning next winter. Meanwhile, I'll lkeep obsessively poring over everybody's advice...

I got my tourist visa in Vientiane. I've not given up on my non-imm O, but have become pretty discouraged about it. Especially after the wasted trip to Bangkok! I may just keep doing extensions and border runs until we go back to the states on May 6, then apply for non-imm O from USA prior to returning next winter. Meanwhile, I'll lkeep obsessively poring over everybody's advice...

Yes that would make things easier. Good luck.