Dun play play with sensors... I tried "Compatible/China" MAF before, it doesn't work, FYI, sensors play VERY IMPORTANT role in our car.
Lambda sensor u can get from UK, try NTK (known as NGK) sensor, I've been using it for many years, that's good sensor from Japan.
I'm looking for Original Throttle sensor and MAF sensor too.. let me know if u know where to source cheap original parts. *kinda wonder... why i wanna change them? I just feel like I wanna change them..!? kakaka..!!!