I don't know how serious they'd be for bmx (even recreational), but I've picked up two mongoose 26" dirt jump bikes in the last few months



https://www.walmart.com/ip/26-Mongoo...-Teal/22861842


both are current projects so I can't say much about performance (not really a bmx-er anyway), but one will get bmx bars, a layback seatpost and gears. hopefully it will be good for general fooling around and wheelies.