i think its going to be 299 but thats just an educated guess.
The Blunderboalt and Droid Charge were 250 as new LTE devices.
These are DUAL core and much more anticipated - 299 most likely - 250 at the bare minimum
The Charge is still $300 on contract on Verizon. So we'll most likely see $300 from Verizon. It was $250 or so from Amazon, and the Thunderbolt was $250 at launch (and still the same on Verizon), and was $180 from Amazon. Amazon's selling the Thunderbolt to new Verizon customers for $50 right now, and about $150 for upgrading individual plans, $180 for family plans.
So I'm going to give an educated guess we'll see the Bionic at Verizon for $300. You can get that sweet Costco deal if you wait until next week (well, if they really confirm it's real, I'm still skeptical), and/or see if there's any other cool deals at Sam's Club, Best Buy (almost never, but good to check?), etc. Amazon should have it for $250 probably if you're upgrading a family plan, $230 for individual, and probably $200 for new customers.