The first 2 items that came to mind are my Weber Kettle grill and Craftsman lawmower I bought new in 2004 when I bought my 1st house. Thinking more my alarm clock is still the same one I won at after prom either in 97 or 98 and I have tools in my garage that were once ones my grandfathers used that I have no clue just how old some are. Not much else around the house that I can think of that I would have bought before 2000.
Edit: just thought of another item, I maybe use it 2 times a year though and appears to be from the mid 70's when I searched. A Montgomery Ward rototiller I bought off craigslist for $75 around 2005 or so. Had to put about $125 or so in engine work in it a few years after buying it but for only being in it around $200 this sucker just eats through turf and build way heavier then new ones are today.