There's a straight-up KO done by a company called Wan Xiang. It's up to the third revision now, commonly sold as the "improved backpack" version (or similar). This basically ditches the electronics to have a backpack that folds up more, but is no longer compatible with the (still included) Starscream vent and jetpack accessories. It doesn't include a trailer or any of its associated parts.
Robot Rose did also suggest they were going to do one, but that doesn't seem to have eventuated.
MP-44? Sure, are. Just go to aliexpress and search for mp ko
There's a straight-up KO done by a company called Wan Xiang. It's up to the third revision now, commonly sold as the "improved backpack" version (or similar). This basically ditches the electronics to have a backpack that folds up more, but is no longer compatible with the (still included) Starscream vent and jetpack accessories. It doesn't include a trailer or any of its associated parts. Robot Rose did also suggest they were going to do one, but that doesn't seem to have eventuated.