I try to give them a couple options, but I do not let them refuse entry.

I understand your home market may not be attainable and there may be a need to purchase in  secondary market that have lower cost barriers of entry but don't focus solely on cost of entry.

Usually yes, however there are crowdfunding opportunities like sparkrental.com that allow for low entry.   

For both short- and mid-term investors, the market's diversity and relatively lower entry costs make it an attractive option.FYI - Philadelphia has a tenant-friendly legal environment, which can present certain challenges for landlords

Urban areas like Austin and Dallas are appealing for growth potential and job markets, but the suburbs and smaller towns offer more unique opportunities (lower entry costs and a steady flow of families and retirees seeking affordability and space).

I moved from Portland OR to Columbus OH because of lower entry costs and strong population and job market growth trends.

If you're still wanting to do it - lowest cost of entry I could think of getting yourself a list of a few thousand properties and then hammering through them for hours a day until you find someone interested. 

Regarding asset classes, there is almost no barrier to entry on cost since most land flippers do their first deal and make like $4,000 which makes it an option for some to start.

The beauty of CA is the lenient ADU laws, the downside is the the entry point to get in. 

The HELOC may or may not disappear, but it will likely be "extinguished" from the property title after auction.After a first mortgage lender forecloses and it's lien is paid off with the proceeds from the sale, any surplus funds from the foreclosure sale are distributed to creditors holding junior liens, like a second mortgage lender or judgment creditor.And by the way, YES you should serve notices prior to entry just to be safe.After you acquire the property, what is the goal?