However, all products shipped via Cargo Containers or Conex's will go up due to a lack of availability of containers. 

Forgive my lack of knowledge here, but what is the best financing option for a US based investor purchasing in Mexico?

. - ideally every operator is sound at all aspects of being an operator, but there are operators who are outstanding at the operational side that are a bit lacking on the communication side.  

Foreclosure auctions are on the table, although least preferred due to the lack of interior access (maybe with more experience).

You could simply sell it, or have you considered doing a mid term or short term rental? 

As for the time of OO yes I think it's a year but I've never seen anything that states you have to move in immediately, just simply you intend to OO not flip or rent it. 

these days buying any free standing SFR with rents much less than 1200 a month is simply not enough Gross revenue to run the railroad.. 600.00 rent on an SFR your going to lose your rear end through cap ex and maintenance.

the reason you aren't getting deals probably isn't lack of experience but lack of money/ down payment. 

Most “wholesalers” are inexperienced, lack specific real estate knowledge, and have little or no capital.  

You should only consider switching when your current software has a significant flaw or lacks features that force you to spend excessive time on workarounds.