You prolly won't find any. Even if you found an ad, they'd go before you could pick up your phone. I have no idea what they would charge. I would never consider selling my SE-L rims, even if I bought aftermarket rims, I'd keep them in my garage.
My suggestion. Get some SE-R wheels, find an SE-L buddy. Take the wheels to a bodyshop, have them match the color and paint all the wheels professionally. Or get them powdercoated. If you paint them you will not match the color and they will scratch.
I damaged one of my SE-L wheels and wound up paying $200 for a reman. one from a wheel refinishing shop. Personally, I've never seen SE-L used wheels for sale. Although, I've personally bought and sold a set of SE-R silver wheels for under $300. I agree with just having them painted.