O m g! There are so many treasures everywhere! Places that def have Y2k/2000s era clothing or pieces can be found in places such as flea markets or discount retailer stores, you can find shirts, jeans, jewelry in there! if you’re not allowed there at the flea you can def go to your local Burlington, Saks fifth, marshals, Ross! They have really cute items depending on your area buttt.. it’s a matter of luck and looking through the racks every so often you could find some stuff!
You can find super cute and affordable items : named brands such that were popular such as Ed hardy, Bebe, the Pink sugar perfumes, Juicy items, Sean John etc!! It’s not really accurate to the full circa 2000s but they have Pieces ranging between the 2000s- 2012! If you’re not looking towards the in person shopping you can probably go online and shop at depop or Mercari ! Even Amazon has a few stuff!
If you need some popular 2000s brands I’ll be happy to name you a few!
Baby phat
True religion
Von Dutch
Happy Bunny
Apple bottoms
Some items are rarely hard to see but if you do some research you could probably find some good deals online!
I know the whole Y2k trend is coming back recently so we see some brands are trying to revamp old clothing you can def see a lot of items coming back such as Jean skirts, Bootcut, flared jeans etc!
I hope that helped out! <3