Would you be willing to do this in BTC terms, not dollars?
Also, can you sign a message from an old address?
I don't like taking long-ish term loans in BTC terms becuase of price changes, so no sorry

Below is an old address and a signed message!
Thank you based OP for giving me this opportunity to make my ten bucks!

1DNwZfpCYkmPP82xty7HThv9ngadjQa2T2
-snip-
Address:
1DNwZfpCYkmPP82xty7HThv9ngadjQa2T2
Message:
SwingFirst here from bitcointalk.org, today's date is February 6th 2016
Signature:
HIBEI9k61XpVcV5Of5Hw9tW5Q3MNVVEGuqxc5deDntWgdczpzTH4RGdBzrfgeiSS7l7IlwhsgxpdJ45xjW6Mzc4=