Hi Babbleon, don't know if they are what you are looking for but I found some lovely ones at www.coralstone.co.uk based in the UK.
They look good so I bought a few of each to check quality before investing in more and was very pleased apart from one particular 6mm barrel, otherwise to be honest you would not know they were plated...they have osme really big ones...over 20mm.
I have used sterling till now but this recession has meant customers are asking me to cut costs..& the only way is to buy cheaper materials without compromising on the look...these beads do that.
take a look see anyway.
Jan
www.janmillerdesign.co.uk