They are available in Savanakhet Laos.
Maybe not the Embassy in France.
although it does mention this on there website:
Attention: For the Non-immigrant visa O multiple entries (175 euros), the maximum duration of each stay is 90 days.
You don't need expensive agents.
Just turn up with a Tourist Visa or Visa Exempt Entry and do it all in Thailand.
you will need 800,000 baht in a Thai bank.