Hi, Tom,
Most replicas are of the 1000TCR, the one with the big rear fender flares.
If you go to youtube.com and search for my user name Pantdino you'll find a lot of uploaded stuff on Abarths.
This one in particular and it's "Part 1" brother are particularly useful for seeing the various forms of the TC line development:
http://www.youtube.com/watch?v=1VBWmWETVVAIf you really want to learn about Abarths you'll want to get a copy of "Abarth--the Man and the Machines." It goes thru the history of Abarth in considerable detail.
As far as cars being available: I looked for about a year from early 2006 to early 2007 and found no attractive cars for sale in this country. I would check ebay, but all the cars were on the East coast and were not very authentic replicas. Most were just Fiat 600's with Fiat 850 motors built by who-knows-who and had some various cobbled up "customization" in very dubious taste.
Finally I decided that I either had to import one or give up entirely-- so I imported one from Germany last year and the price was much less than what it would cost to make my own. If you are a mechanic AND a body and paint man maybe it would be a different story.
You'll want to go to scuderiatopolino.com and email Paul van der Heijden-- he will know what cars are available in the world. (He found mine for me.)
Where in California are you? I live in the Los Angeles area.
If you live near me you can come by and go for a ride in mine.
Jim Oddie