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They have 5m spools of 60 LED/meter strips for $25 here:

https://www.ebay.com/itm/WS2812B-Strip-LED-Lights-5050-RGB-3...

I've ordered here without any problems: https://btf-lighting.aliexpress.com/store/1051119

WS2812 LED Strips on AliExpress/Alibaba/BangGood are sorta okay. I've got a few of them at home, some of them have LED's shortcircuited after they failed.

To some extend you get what you pay for but they're good enough for most purposes (and if they go too much kaputt you can replace them with another one for the same low price) and fairly bright too (about 0.25A of LED per meter and 30LED/m density)

Ebay is worth considering for these too.

ray wu on aliexpress/ebay(I think?) has a good reputation and is widely used