Low-end arms are ~5k. This is just quite small, a Mitsubishi RV-FR series, payload ~5 kg. 300k+ robots are things like the KUKA KR1000 ("Titan"), which can literally toss around cars. It's got 200x higher payload for <20x the cost; if anything small arms are overpriced (they are- the only current use cases are pharmacies, low-end semiconductors and medicine).

Anyway, Mitsubishi is well respected and this is a very good arm.

[1]: https://us.mitsubishielectric.com/fa/en/products/industrial-...