If you're turkeying this Thursday, you can still brine your turkey if you buy one already thawed. Costco has some 'organic' ones for $2.50 a pound or Foster Farms for 89 cents a pound. Neither are brined.
No time for a dry brine: Use the wet brine method. Works just as well.
You can save time by buying one already brined. The label on a brined turkey will say something about being packed in or injected with a "solution." I recommend the basic Butterball as these are not over-salted the way some are. Note that not all Butterballs are brined — read the label.
Trader Joe's has Kosher and non-Kosher pre-brined birds. These are probably good, though I have found Kosher birds are often saltier than I like.
If you buy a frozen bird, you will need to thaw it in running water — no time for a refrigerator thaw.