Looking to try out digitizing some invoices, as well as talk to people who want to digitize invoices

First of all, just want to say that this community is a revelation. Really nice change from the entrepreneurial community on reddit, which is where I've been hanging out. Anyhow, I'm the developer of Paperpusher, which is a Google Sheets add-on that uses 3rd party OCR to digitize receipts and invoices.

I've put Paperpusher through its paces digitizing receipts, and it works alright (although I really want to integrate OCR into the add-on eventually, rather than have it in a separate 3rd party service). I haven't really gotten a chance to test it out on invoices, even though I think that's where its first/most important use case would be.

Does anyone know people (presumably small business owners) with invoices I could digitize? I'd be willing to pay for their time, and delete the data once I'm done.

Also, is anyone here someone who regularly digitizes invoices? If so, what sort of solutions do you use, and what sort of problems do you run into?