Examples in the UK: https://marketinvoice.com/ http://www.platformblack.com/ or even http://granttree.co.uk itself (though we don't advertise this at the moment - our power-up fund does extend to invoice factoring for startups with no trading history).
It's shocking how many big companies will send me book-length MSAs, T&Cs, etc and expect me to just sign it. A lot of them have some scary-sounding clauses in them.
It seems especially weird for a buyer of a SaaS product to have their own T&Cs.
Recently I was asked to sign a 30 page T&C doc from a potential customer - and I just said no. To my surprise, they said "ok no problem, we'll just use yours".
I tried this again with 2 other customers, and so far it's worked 2 out of 3 times. On the one that didn't, I'm still kind of in limbo - waiting for a PO nearly a month later... Based on your comment, it sounds like I'll be waiting a while :\
Yep. Also, small companies dealing with MegaCorps - please, just accept our terms & conditions. Raise the price by 20% if you have to compensate for whatever rights you feel our standard T&C doesn't give you, I don't really care. But if you want your own terms, then your lawyers need to talk to our lawyers and there is a 50% chance that your PO will arrive after man lands on Mars.