[Calpublican]

You and me in this instance is correct.

You and I go to the store because I go to the store.

We buy something for you and me because we buy something for me.

[Resettozero]

You and me in this instance is correct.

Me am okay with however you wish to post on FR. (Not a charter member of the grammar police but DO have a respect for my native language, even when me choose to bastardize it on my own volition.

Mrs. Kimzey in the 7th Grade taught us -- before writing or speaking -- to mentally add the verb that is implied. In the sentence referenced today, the implied verb is "are". As in "we are" not "us are". Reduction to the singular reveals the verb and tense implied would be "am" as in "I am" and not "me am".

Little lesson from Mrs. Kimzey was worth money to me in many years of public speaking.

How you use the lesson or not is up to you.