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Once in a blue moon
Doesn't happen very often
Hit the hay
Go to bed
Costs an arm and a leg
Way too expensive
Kill two birds with one stone
Accomplish two things at once
Don't cry over spilled milk
Don't make an emotional outburst over something small
Make a long story short
Come to the point, leave out the details
Every cloud has a silver lining
Every bad thing has its end; bad things have something positive about it
The best thing since sliced bread
Something outstanding; really good
Cut corners
Making something easier by avoiding or skipping steps
Blessing in disguise
Something looks bad at first, but has a positive outcome
Bite off more than you can chew
Taking on task(s) that are/is WAY too big or complicated
At the drop of a hat
Do something instantly
Back to the drawing board
Almost complete, but you have to start all over again
Don't judge a book by its cover
Don't judge someone or something just by its looks
Feeling under the weather
Not feeling well; sick
Give the benefit of the doubt
I'm going to let it slide without any proof
Barking up the wrong tree
Blamed the wrong person
Cross that bridge when you come to it
Don't worry about it until it approaches/happens
The last straw
The final time to allow the worst to happen; last time for something to go wrong
Taste of your own medicine
Doing something bad back at someone who wronged you
Don't quit your day job
You're not good enough to make money doing something
Don't put all your eggs in one basket
Don't put all your resources on one possibility
Don't count your chickens before they have hatched
Don't plan things that will not happen/come to reality
A penny for your thoughts
Want to know what's on your mind
Hit the nail on the head
You're exactly right