where can i find LOTS AND LOTS of SCRAP METAL!?

If memory is serving correctly, the REPCONN test site west of Novac.

Have you f*cked up Volare?

1. Where Fisto is in Freeside (Atomic Wrangler quest).
2. There's also a Steel Factory in West Vegas.
3. REPCONN both offices.
4. Gibson's Scrap Yard.

Are you looking for 100 pieces to give to Isaac? If so, also check campsites. Pick up every tin can and bent tin can you can find.

He takes tin cans, bent tin cans, and scrap metal.

Of course, if you are not doing this for Isaac, just ignore my reply.

in the corner of camp carran is a bunch.
you can steal a load from the dam too.

but if it is that isaac/contreras quest i recommend going the dialoge course,as 100 scrap will take a while and its better used for weapon repair kits.
[you can make a fast fortune rpairing weapons before sale]

If you are doing the Isaac/Contreras quest, you can find over a hundred tin cans in the Aerotech Office Park, Suite 200. The place is full of 'em.