Accounting software for multiple entities

[Nick Horob]

I'm soon going to have 6 different LLC's containing different assets and business interests. Currently looking at a couple deals that could add a few more entities.

I'd like to use Quickbooks Online or Xero bit can't justify the expense.  Most of these entities only have a few transactions every month.  

What would be my best route for accounting software?  My current thinking is to use Google Sheets to do it manually and map receipts to Google Drive.

There has to be a better yet still cost effective method....