Stores that are accepting PND through them:

http://www.echabit.com
http://www.whipstergear.com
http://xbox48.bugs3.com
http://www.cryptocoinstuff.com
http://www.thestakingmachine.com
http://bitstickers.net
https://store.cryptopools.com

We could use more suggestions. Please feel free to message me if you want any store to accept PND.