I have a ton of ultracheap/ultralight items in my gear closet! I recently made an LighterPack Link that shows you how to make an entire 7.5 pound ultralight setup for under $500 total, which includes a lot of Aliexpress items.
You can't post links directly to Aliexpres (it gets automatically marked as spam), so instead search Google or Aliexpress for the string of numbers that I post.
Keep in mind that most items on Aliexpress are also available on Amazon. Occasionally it is cheaper to buy on Amazon. For example, the AegisMax down balaclava costs $25 on Aliexpress (32817757626) but only $21 on Amazon.