one example i know of: http://scaleworks.com/

they bought Filestack (formerly Fileppicker), Chargify and a few more

Lew wrote about basically the same thing as sama earlier this month: https://medium.com/@lewmoorman/not-venture-scale-get-over-it...

My e-mail is in my profile and I'd be happy to help you get in touch with them if you meet their parameters.

Most of them are looking to do just a few deals a year.