Welcome to the forum! I think if anything , you might find too much info here, definitely no shortage.
You might check Lowe's online and take a look at the chargriller super pro w/ side fire box. It's an offset which is user friendly, and doubles as a fair charcoal grill. It can be had for the $200 range.
There are bullet smokers available for under $100, but they don't hold much, and they really limit what you can do and how you can do it.
Be sure to remember that whatever you buy, within a year or two, you'll want to replace it w/ something bigger and better.
Of course, that'll be easy, because by then your wife will be hooked on your smoked food, and will be ready for anything that will allow you to do it better and more often.
Good luck in your efforts my friend, and never hesitate to ask for input!