Best place to buy used ds?

Discogs, eBay and Mercari if I’m searching for a specific CD for my collection.  Beyond that church fairs and yard sales and estate sales.  

I go the garage sales. My last buy was 1100+ CD’s for $150.  I kept about 175, sold about 275 for about $150 and gave the rest to Saint Vincent’s. When all was said and done, I got 175 CD’s for free and I paid for my gas and I had a deduction for tax time. My wife stops into thrift shops and every now and then finds a SACD (for me) and a disk of something she likes.

Oh and if you have a used record store or Vintage Stock has 2 for one sales for every holiday.  They also have everything on their computer system so they can look for something specific for you.

I've been finding places in the area,like the library a dollar each...fot single or double or box sets.A thrift  by me they were 5 for a Dollar come on 20 cents each thats nuts all in nice condition.