I agree, check thrift shops and antique stores! These are beautiful and I think they deserve nice frames but I wouldn't spend that much money on brand new frames. Ebay will also have some great old ones for cheaper than new.
I don't think the Kelly website is the same artist, even though the signature looks so similar. I noticed that the Kelly on the website signs the entire name not just Kelly. And these look genuinely old from the pictures, 100+years. I also don't think someone would have paid good money to an artist to have these done recently. They would be pretty out of date. Unless someone really loved their grandparents or something.