Not a WPMU dev issue really, just reaching out to find any good suggestions.
On my multi-site I currently use Grunion contact form, mainly because it is written by Automattic, uses Askimet to deal with spam and plays nicely with multi-site.
Contact forms can easily used for request a quote, and grunion allows adding extra fields and field types.
But one of my sites wants a date/time picker on their quote (it is basically a simple availability request - and they don't want to go the route on online bookings like Appointment plus)
I'm sure gravity forms would do the trick, but I have never used it and it is probably overkill.
I can see contact form 7 has an extra 'date picker' plugin available, but I have no idea of the quality of the date picker product etc.
So looking for main stream solutions, that don't involve much time to get going, as this is probably a one off.