@markbnj I saw there were several, but none inspired much confidence. I emailed one and they said they don't offer 1.1 anymore to new customers, so I'll keep exploring.
@train I've tried running the site with 2.0 and 4.0 in IIS locally, and certain aspects of it break. I've also tried migrating to 4.0 using the visual studio 2013, and that works better, but there is still some advanced functionality that doesn't work. I'm hoping to avoid spending any more development time/money as it will likely be replaced with an entirely new site next year.