What would you pay for a note handwritten by Kurt Cobain? Singer-songwriter Juliana Hatfield is wondering because she has such a communique from Kurt, and she’s considering selling it. In an entertaining essay posted Thursday on The Talkhouse website, Hatfield writes that sometimes, when the bills pile up, she sells stuff. “In recent years I’ve sold most of my guitars and I’m down to just two small amps,’’ writes the former Blake Babies frontwoman. “I sold a ring given to me by an ex-boyfriend who didn’t treat me right. I sold three signed Salvador Dali prints at auction, prints I’d inherited from my father when he died.’’ But there are a few items she’s saved in a shoebox, and the note from the Nirvana singer is one of them. Written in 1993, after Cobain and Hatfield met briefly after a show in New York, the letter is short and very sweet. “Julianna, Your song NIRVANA was totally flattering when I first heard it. I really like your new album especially my sister,’’ Cobain writes in a messy hand, spelling Hatfield’s name wrong. He concludes with: “I wish you all the best. Have a good time in England and don’t eat the kebabs. Love Kurt.’’ Quite arbitrarily, Hatfield decided the letter could be worth up to $20,000, even though a local auction house told her to expect perhaps $1,500 to $2,500. “That estimate wouldn’t even cover one month of my living expenses,’’ she writes. “I told the auction guy that I was going to hold on to the letter. I couldn’t let it go for so little. That would be sad. Because the truth was that the letter meant, and still means, a lot to me. More than money.’’ Or does it. “If you are interested in buying the letter, I will consider any offer of at least $20,000,’’ she writes. “Because I have rent to pay. But I won’t give it up for any less than that. And even then, I still might decide, at the last minute, to keep it.’’