You do need to watch out with the black Friday deals, in general but power tools definitely do it as well.
Make sure the model number of the product on “sale” is the same as the model number of their regularly stocked tools. Sometimes they will bring in special models for sales which are build cheaper and lack specific functions than the regular ones they stock year round, and the model number will be FROTY345B instead of FROTY345A or something.
Usually rats hang out in areas that provide them with food or shelter
Do you have a compost bin or a messy yard where it might feel comfortable?
Might be best to take care of those issues first otherwise even if you kill it another one might just move in right after.