Motel 6 & Job Seeking??? Kind made me wonder 'exactly' what you were referring to there Mega LOL!!
Sounds like you are handling things very well. Glad to hear it. Isn't the peace and quiet refreshing, to say the least? Enjoy!
Regarding your final commission check. Do they take taxes out? If so, and it is a relatively large sum, the $1,100 difference 'could' be attributed to that. With higher earnings, the higher the tax amount they take out. They don't give any consideration to it being a lump sum one time only thing. Figure out what you think you earned, then look up what the tax liability would be for federal, state, city (if applicable). That just might be the difference.
Keep us posted on the job search, oh and, don't settle for less that what you deserve!