You should have been around probably 4-5 yrs ago when the cheapie 'Chinese' ones started appearing to see how many came short buying them.
It's been reported 'ad nauseum' that the Bosch is the only reliable one (except Pierburg with Mafam)
This is cheapest source we know of at present. Took 5 days to arrive.
http://www.ebay.co.uk/itm/BOSCH-MAF-...item1e6e51854d
There seemed to be a lot of MAF problems just after buying my car new in 2003. They were also about £120 then but managed to get an original Bosh for £60...........it's been on the shelf since then ! Oh well, guess the platignum wires in it won't go rusty ! ! (only done 53,000 miles so early days yet)