i think i saw some aftermarket MAFs for about $30-50... but i would not trust an aftermarket ones... saw a Siemens/VDO for about $180 brand new on fleabay...

go to furiousmethod . com, plug in this part #13627567451, enable the pop-ups from that site and click search... do not worry when you start getting whole bunch of windows popping up, those are individual websites that carry that particular part... go though those sites, find the best deal for yourself and order the part...

if you want to take a chance with an aftermarket item, try the one for $30 but i would not recommend it.. maybe, just to hold the fort over until the real thing arrives, and then send the junk back...