You could place a classified ad in the newspaper or on a site like Craigslist, offering to buy collections of records.
You might also put out an ad in a local newspaper or classified ad website announcing that you are interested in purchasing old copies of HD-DVD. eBay is another place that you can still purchase HD-DVDs.
Depending on your situation and the types of items that you want to sell, you may want to offer items for sale from your home via a classified ad in your local newspaper or online classified advertising web site.
Craigslist is a classified ad wonderland.
A free classified ad board is available where members can offer their services.