I am looking for a payment app for QBO that accepts US Credit Cards. I found Freedom Merchants. It seems pricey, but does anyone have any helpful reviews/suggestions?

Try Plooto.

Its decent option for payables and receivables for multi currencies.

Hi SYLT. Thanks for reaching out to us here. While QBO Payments only accepts funds in Canadian Dollars, I recommend taking a look at third-party apps such as PayPal which you can ingrate with QBO. To search for the apps which allow you to integrate your Payment Processor with QBO, visit www.apps.com and enter the name of the Payment Processor you'd like to use (PayPal, etc). If you have further questions about this, don't hesitate to reach out. I'll be on standby.  

If you run a service company, you can also explore a proposal management app to sync with QBO.