Assuming Deckard is based off the Deck, I don't think we'll see costs any lower than that considering all the extra hardware and tech that goes into a VR headset. It depends on how much storage Deckard ends up with, but I'd expect at least 256GB. Given that costs $530 on the Deck, I wouldn't expect any less than $600 and that still feels too low considering the need for new controllers as well.
tbh, I wouldn't be surprised if it ends up costing $1000 again, but would be pleased if it's a few hundred less due to not needing to include the base stations. If I had to bet, I'd guess around $800. Maybe they'll offer a tethered-only version without the hardware for it to function standalone that could be cheaper?