this/that

If you're IN the shop, use THIS. (Present tense)

If you're OUT of the shop (talking past tense), use THAT.

I suggest that you should also strike out elsewhere. The word another already implies the sense of "elsewhereness". (Though you might want to include some such phrase as "near here" or "in this town" to qualify the statement. )

And to be really idiomatic, I'd say that "you won't find" or "you couldn't find" sounds more natural than "you can't find".

Thanks for your replies.