American coins for sale

Is there anyone interested in buying my American coin collection with double die and errors I have liberty quarter with double die and minting error and also no one sent coins I have seen them on line 91 of them goes up into the thousands I am looking for a quick sell to raise money for a very good cause.

I also have a collection of euro coins from loads of different countries I have looked quite a few of them up up-to-date have minting errors and are rare if anyone is interested please let me know or if anyone knows how I can sell them took photos for an online auction and received valuations however they only auctioned them outside of the UK and to get them insured to post was very expensive so I backed out