I would be willing to pay 20 dollars if you throw in a free gift.

Translation language

Sentence

Narrator

I'd be willing to pay $20 if you include a free gift.

My offer is $20, provided a free gift is included.

I'm interested, but only if a free gift comes with it for $20.

That's a bit high; I'd pay $20 if a free gift was thrown in.

I am prepared to pay twenty dollars contingent upon the inclusion of a complimentary gift.

I'll give you 20 bucks if you add a freebie.

I'll pay $20 with a free gift.

Prepared to give money for something.

To include something extra.