Walmart has a 29" men's bike with disc brakes for $199 online and if you ship to store, you can have a manager price adjust there to $129 (correction, apparently $100).
Huffy 29" Men's Warhawk Mid-Fat Tire Bike, Black
Steel frame (heavy) but has a sealed crank cartridge and a lot of nice features for the price.
I just found this bicycle boxed at my local Walmart: Huffy 29" Men's Warhawk.
I was trying to do a ship-to-store and it got lost (maybe this was it).
Local price was $100, which is eye-popping for front and rear disc brakes, quick release wheels, 29 x 3 tires, quick release pedals.
If you find one in store, this is a good deal.
Original price was $250, rollback to $199, clearance at $129 and for whatever reason, priced out at $100 at the register.
Bought this for my oldest son and he loves it.
I'm going for a second one (this one is for me).