I'm in the process of selling my CD collection (700+). Update 6/2015: I've been doing this about 2 months now, sold 300 discs, and made $700. I'm moving into my DVD, video game and book collections now. It's been fun and totally worth the effort!
Amazon's app is easily the best to quickly check if an item is low-worth or possibly still worth something. It can recognize the cover or the UPC. If the used price shows as less than a dollar, it means it's a popular title, and I put it in a "low value" pile.
For the low value CDs/DVDs, I've been using a few sources - local music stores, secondspin.com, selldvdsonline.com, decluttr.com.
- Local music stores are hit or miss. One store didnt take much but paid well for what they did take ($2/disc). Another store took nearly everything I gave them but it averaged under 50 cents a disc (not great for the quality of items I gave them). I'd suggest asking them to separate anything they are offering less than a dollar. My used CD store said niche genres don't sell unless they have regular buyers looking for something (country music doesn't sell as well as jazz here, for example). They offered to buy my whole collection out-right, but I wanted to peace-meal to get the maximum prices out of my CDs.
- Secondspin.com gives decent rates for mainstream CDs. I'm getting $1-4 for CDs that decluttr.com quotes at 10 cents or 40 cents (and Amazon at $0.01). Secondspin charges 35 cents to refinish scratched CDs and 35 cents if the case is broken. As of 4/27/15 I've sent 150 CDs and only had a handful need resurfacing. Every shipment has needed a couple new cases. The first 150 CDs I sold I netted around $150 through Second Spin.
For cataloging: I've scanned the UPCs into a spreadsheet (I like the app "Beep"). If you don't have a smartphone, there are barcode scanners you can get on Amazon for cheap. Second Spin has an option to "sell in bulk", where you can paste all of the UPC codes. Generally, I try to only sell a CD to them for $1 or more. If Second Spin has enough in stock, they will offer 40 cents or 10 cents. If you have the space to keep the CDs around, just keep a spreadsheet of the UPC codes and periodically bulk add them all to your cart. Then, just sell the ones that are $1 or more. Be careful of promotional items (hole or crossed out UPC, cutout in case) - If you email Second Spin and ask first if they will take it, you'll get a confirmation letter to include with the shipment. I've only had one disc not accepted and it's cause I didn't do that first. They pay return shipping if an item is rejected, so if you're not sure about a scratched or damaged disc, just send it in. Decluttr makes you pay return shipping if you want the item back (I think).
There is software (monthly service) you can get that will tell you more accurately the value of media. For selling a small consumer collection, I didnt think it was worth the cost. If you're looking to do this as a business, I would definitely look into it.
For CDs worth over $5, it's worth the effort to list on Ebay, Amazon, or Half.com (Half will list on Ebay, also). Amazon takes a high cut, so after shipping is paid, the net profit ends up being about $2 less than the purchase price. So, a $5 sale will net about $3. But, sales on Amazon have been much better than Half - I've been selling 1-2 items a week on Amazon and 1 a month (if that) on Half.
- FYE.com gives comparable rates to Second Spin. The shipping notes are identical, so it might all be processed at the same place.
- Decluttr takes anything, but may only give 10 cents or 40 cents for most discs. I've been going through and deleting all the 10 cent ones and only selling 40 cent or more. The nice thing about Decluttr is that they pay for your shipping and have great customer service. Selldvdsonline.com is a similar service that doesn't give a lot. But, if you can get 40 cents for discs that are clearly popular and unwanted (for example, popular 1990s titles or old classical music) that's doing pretty well.
- I recently discovered the site bonavendi.com, which has been good for verifying prices (when needed)
- Anything low value but education value (i.e., jazz, classical) is going to be donated to a charity for the tax write-off. I've got a local music NFP that is always in need of certain types of music.
Books: I've started selling my book collection using the same technique. Books definitely do not hold value, and they are selling at a much slower rate than CDs and DVDs. Occasionally one is coming up thats worth listing on Amazon. I haven't been selling books long, but I don't see the return being the same (for the effort) vs other media.