The landing page is a single page thing, jump links on the page, then a form to collect an email.
With regard to responsive design, cross browser stuff being a given/addressed... $30K?
Point of this is I'm trying to see if there is any reason to think this is reasonable.
Hosting/certs is a minor concern could be done by you or provider. No changes to the site after it's done.
I would also add that you're a startup/don't have cash flow, maybe some kind of investment/seed money.
Even then, 30k for a single page, which I assume is static, is kinda ridiculous. The only justification I can think of is very, very good design from an expensive design agency.
For the dev work we are talking paying someone $300 / hour for over 2 weeks. Seems out of my reality.
Spending $30K might make sense if the landing page just part of the deliverables. For example, I can imagine if you went to a marketing firm and they are assisting with branding, copywriting / editing, syndication, social, etc and the landing page is just the most obvious deliverable of the bundle, then... sure, you could spend $30K really fast.
If I can make $1000 for $20, I'll spend $20
But if I could make $100,000 for $30,000 - dang straight I'm gonna spend $30,000!
Sounds about right. Maybe you need a cheaper agency?
You would get the exact same results for $1k and $30k, the only difference would be the developer's profit.