now you mention it

any time now

Very soon.

come to mention it

What you just said reminds me of something; Used to justify a change of subject or a kind of statement that needs some kind of license.

honorable mention

An award or recognition given to a person or thing who does not achieve a higher standing but whose performance or entry was noteworthy.

make mention of

To briefly refer to something; to mention.

now and again

Synonym of occasionally, sometimes, intermittently.

now and then

Synonym of occasionally, sometimes, intermittently.

now for

Used to introduce something that is to occur or be presented next.

now or never

At this sole opportunity or time, or not at all.