@Drew ********
IF you obtain the Non O Visa as retiree in the USA, there is no requirement that the 800,000 Thai baht must be in a bank account for 3 months.
Only show PROOF of your having a bank account balance of 800,000 Thai baht.
THIS is FROM the Los Angeles Thai Consulate website...
Non O Visa as retiree...
Applicant must have a bank deposit of
4.1 Account balance no less than 800,000 Baht or
4.2 an income certificate (an original copy) with a monthly income (pension) of not less than 65,000 Baht, or
4.3 a deposit account plus a monthly income (pension) totaling not less than 80,000 Baht.
5. Hotel booking or accommoddation arrangements.
6. Itinerary showing flight from U.S. to Thailand and flight out of Thailand.