You can try looking on AliExpress, but in the end I believe the best deals usually come from buying used poker gear, Facebook Marketplace is a good example. You often get much better value for your money if you’re willing to check listings carefully and be patient.
If you're looking for chips that actually feel good to play with, I'd avoid the really cheap plastic sets. Clay composite chips are a great balance between price and quality, while ceramic chips are my favorite if you want something that looks and feels closer to what you'd find in a casino. I've had good experiences with Apache chips and The Poker Store, and many people also recommend BR Pro Poker for custom sets. It really depends on your budget, but spending a bit more on a solid set is worth it if you play home games regularly.