What kind of stuff are you buying new? Towels would be good from Bed Bath and Beyond etc., as soft towels here are really hard to find and even harder to pay for. Make sure all the stuff has been used, that's all. No tags, obviously worn / washed, etc. This applies to textiles. Same story with sheets, but be aware that the sizes are all different and if you're getting a bed once you arrive and you've brought standard US sizes they may be hard to match up.
If you've just bought a new sofa, you may be sunk, but I do hope you're not talking about furniture when you say you've been upgrading things -- you can get furniture here too and save your shipping fees. I see from your other posts you have a two-year-old -- he can help you make anything look used in the next two months. Not so much fun for the furniture though.
You shouldn't need alcohol (cheaper here than there), drugs (you'll bring like what, a bottle of cheapo generic aspirin and ibuprofen in your regular luggage not your moving boxes, maybe some Children's chewable orange-flavored aspirin and Sudafed) or food -- see
http://www.toytowngermany.com/munich/Briti..._American_Foods for a good idea of what's available and what's harder to find bzw. more expensive here than at home.