Inversion or no inversion after "only"? [duplicate]

When I first saw only now you can get them I though it was ungrammatical, because, as you say, only normally triggers inversion.

However, it is grammatical on a different reading. In everyday speech, only can also function as a conjunction, with a meaning similar to but. There will be a different stress:

Only now can you get them

with even stress on only and now, means "You can get them now, but you could not get them before".

Only[,] now you can get them

with only unstressed and probably rather quick, and possibly in a separate breath group (represented by a comma in writing), means "Contrary to what has just been suggested, you can get them now".