If you feel like you need "to get rid of your rats" you have to take an honest look at yourself, especially if you replace them with another pet for any reason other than allergy or finances.
It could very well be an inner restlessness that needs to be filled with something exciting because your life as it is, isn't going so well. That's why, after the novelty wears off, the other pet will also be discarded to satisfy the void in your life. So instead of getting a new pet, try to solve the underlying issue.
If your boy/girl friend wants you to "get rid" of them, you better take a good look at the relationship with that person because someone who wants you to give up something you love, is controlling and it will get worse.
If you are tired of cleaning the cage, remember the time how excited you were when you got your rats and how "cleaning the cage" would never be a problem?
If you don't have time, clock the hours you are watching TV, texting, playing PC games. One of those hours could have been spent with your rats who would have loved your company.
If they bite, go back to the forum to get some help. Most problems can be solved or you accept them for who they are and after they pass, you get a rat that is known to be gentle. Some rats have had a hard life and are not able to trust again.
Many children undergo the CL syndrom themselves as their parent(s) replace(s) one partner with another; step parents coming and going so that's how children learn that living beings, animal or human, are easily replaceable.
So now take a look at how you would feel if you were this pet, depended on food, exercise, hygiene, love and entertainment on you. Would you like you as your owner?
If the answer is "NO" then re-homing is not the solution but changing your habits and attitude is.
Take a good look at your rats or any other pet you consider to give up. Is all the love really gone? Remember the good times, pet them, play with them, clean the cage and you will most likely start enjoying them again. I'll bet when you kiss their soft belly, you'll be smitten again

Hopefully this gives some insight in all of this.