I am in the same boat. There are very few used ones and I have yet to swallow the price of admission on a new one. It looks like RCR makes a pretty good car in a kit form. Since RF went out of business, I would be hesitant to buy one of those unfinished because of parts/customer service issues. I checked out the SPF, and their basic take on the thing is by the time you buy the car and then put the 9K transaxle and engine of your choice, you are gonna be over 100K. hhhmmmm. not sure I wouldn't want a different type of car at that price. ERAs are scarces as hen's teeth and a new one apparently is 3+ year wait. The one thing that I like is that RCR has a roll bar built into their mono chassis. The CAV car does not have one..rollbar... (tell me if I am wrong, I am only going by the pics on their sites). So right now, the RCR with roll bar and available in various kit stages are winning in my race right now. Anyone with a finished ERA for sale, CALL ME! (smiles). on
www.gt40s.com there is pretty large australian group of guys that have various kits there that may be useful to you....but I am sure you have checked that out.
all being said, it looks like a look wait and keep searching for the right one
Buzz