@Patrick *************
, just so you're clear about it, The fact you might apply for an in country Non-O visa while you're here on a 30 day visa exempt entry is NOT reason enough for the immigration officers to waive proof of funds, proof of onward travel or proof of lodging. So have the proof of funds with you, AND be prepared if you're asked to show proof of onward travel (they'll let you book a ticket right while you stand at passport control IF you need to show proof of onward travel).