Technical cheapest place for lambda sensor?

[fiatpunto1995sx]

My 1995 75sx has a misfire problem, it runs perfectly until the the engine warms up at which point it misfires slightly from 2-4krpm but runs perfectly at low revs & above about 4k. misfires enough for poor acceleration but still goes. Might be plugs & or leads but if it eventually needs a new lambda sensor, where is the cheapest place to order 1 from?

cheers,
Rob.

 

[thelad]

I googeld it a while ago and found 1 for £51 (carnt remmber the website) was not a fiat 1 thow think it was universal, has anybody every tryed them? Dont know what they would be like.