Cheap Goon Glass Driptips
You can get these from Fasttech for $4. They fit perfect. Glass could be a bit smoother IMO. I bought a black and SS. The SS glass cracked during shipping, but they do package these reasonably well to prevent that. Other reviews look great as well.

https://www.fasttech.com/products/3016/10028163/6163701-glass-stainless-steel-hybrid-drip-tip?&m_override=1