Yes the '57 Ranchero on Spotlight Hobbies site is a nicely built mild custom. I'm not a custom car builder, so I would put it back to stock. I had thoughts of buying it, but decided not to as well. They do have one that is unbuilt for $50 also. Shipping isn't too bad from them, but it still costs ya! I am waiting for the new Revell '57 Ford 300 Sedan that they have coming out, also. Gotta have one!
I've only bought a couple of things off ebay. It was in 2005, and the shipping wasn't too bad on one ($6.50), but the other one was $17. OUCH! Haven't bought anything since. If you compare this with putting gas in the car and driving for 45 minutes to an hour to the hobby shop, it really isn't that bad. I can't drive to my local hobby shop and back for $6.50. I can for $17 though! I know it goes by weight and destination, and I had a little bit of weight to the $17 shipping purchase. There were a bunch of old tires in the mix. Shipping has gone up a bit in the last 7 years, unfortunately.
That's the bad thing about buying a "lot" of stuff off ebay. You have to take everything in the lot, even if you don't want it. If you have an outlet for the unwanted stuff, then you are in good shape in that respect. I belong to a model car club also, and the guys are always swapping parts, or giving them away!