We have spectrum of implementation partners across all geos who specialize on D365 Marketing, and have their staff certified on D365 Marketing -- so the ecosystem has all kind of partner support for customers for going live for their business scenarios. Definitely there seems
Can you please be specific on what kind of implementation support you are looking for (event management, email marketing, inbound pages, industry specific AND what geo: US/EUR/APAC etc). Based on that we can guide further on the right resources to look through.
(and of course, Channel Partner is incorrect. Microsoft is invested in the long term success of D365 Marketing, and partner ecosystem is integral to this success!)