I picked up a 2012 with 168 hours, painted in good DuPont aviation grade Imron, everything you could imagine on it, Skyview Classic, SL-40, Flight Com 403, interior, except AOA, in May, here, in the low $50's.
It's only worth what you're willing to pay for it, and the seller is willing to let it go for.
I spent about 18 months looking, the stuff pre 2012 with Dynon D-180 EFIS was actually selling low to high 40's. Skyview Classics in the 50's and Skyview Touch, with GTR-200, high 50's to 60k, usually 2015 to 2017 builds.
Those are prices for the Legacy model. The RV-12 IS is whatever the market will bear, it's got a much nicer interior package.
Generally speaking low hour planes, probably under 150 hours or less in Legacy models, have had inspections done, and none of the Service Bulletin updates performed. The parts aren't expensive, but it's a LOT of work to get all the updates installed, after it's built, vs, when in the construction phase.
Good luck with your search. If money is no object, pick the one you like. If money is a little tight, patience is a virtue.
Go to the order sheet on Van's to build a RV-12, option it up, and see what the total runs. Then add in all the tools and other extra's along the way that you'll need to build it. Don't forget shipping and sales tax in your state. My rough estimator says somewhere between $80 and 90k, depending on how stripped or loaded with options you want to go. Do you want to build or do you want to fly? Probably a better value to buy someone else's used RV-12, if you'd rather fly. Building is a good excuse to stay in the Man Cave and avoid the wife and kids, if that's what you seek, but you'll be buying that peace and quiet and solitude time, if you go that route.