Parentheses and Two-Sentence Slogans

PART A

Are these correct -- two periods within quotes?

• "We drink all we can. The rest we sell." was a Utica Club slogan that had a significant impact.
• "Thousands of possibilities. Get yours." was an old Best Buy slogan.
• "There are some things money can't buy. For everything else, there's MasterCard." was an infectious MasterCard slogan.
• "Have a break. Have a Kit Kat." was an old mantra.
• "Give me a break! Give me a break! Break me off a piece of that Kit Kat bar!" was an infectious seventies ad.

PART B
I'm assuming, though, that these are all correct.

• An old Utica Club slogan was ""We drink all we can. The rest we sell." (Comma before "was"?)
• An old Best Buy slogan was "Thousands of possibilities. Get yours."
• An infectious MasterCard slogan was "There are some things money can't buy. For everything else, there's MasterCard."
• An old mantra was "Have a break. Have a Kit Kat."
• An infectious seventies ad was "Give me a break! Give me a break! Break me off a piece of that Kit Kat bar!"

PART C
And finally in PART C, do I place a comma at the end of the sentence in one-sentence slogans and sayings within quotes, or do I leave out the comma as I've done in each sentence below?

I'm assuming that you just omit the ending punctuation in one-sentence slogans or sayings. Yes or no?

• "The Champagne of Bottled Beer" was a famous Miller Beer slogan back in 1941.
• "You'll never put a better bit of butter on your knife" was a popular corporate slogan of Country Life butter in the early sixties.
• "And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus" was a well-known biblical saying.

Thanks!