There're is common in speech, at least in certain dialects, but you'll rarely see it written. If i were being pedantic, i'd advise you to use there are in your example, because there is is definitely wrong, so. A google books search for always a bigger fish yields two relevant matches, albeit with quite different connotations.

There are so many questions on this website. There is so many questions on this website. The former sounds right, but the contracted form of the latter does as well: There's so many If there is no place like x, what exactly is x? Your first meaning would be the one assumed to be understood, unless context ( 'don't be silly! There is no place like mordor. ') demanded otherwise.

If there is no place like x, what exactly is x? Your first meaning would be the one assumed to be understood, unless context ( 'don't be silly! There is no place like mordor. ') demanded otherwise. There are so many vs. There is so many there is/are one or several apple/~s? Is there versus are there there is/are more than one. What's the difference? Should i say there is a.

Is there versus are there there is/are more than one. What's the difference? Should i say there is a.