Amibay.com is a good site to buy and sell Commodore hard- and software. There are plenty of people who still develop hardware for Commodore computers and sell them through Amibay.
One of them is Antti from Helsinki. He made a lowcost copy of the Zoomfloppy. Zoomfloppy is a interface between a modern PC and a 1541/1571 diskdrive. It uses a USB port and with the openCBM software you can copy files and d64 images to and from you PC to disk. It's a wonderful piece of hardware for little money.