I would like to trade my longer M/L sport bands with someone for their S/M bands (just the bottom ends, not the top). This would give me a backup that is useful (I realize it's only half the band, but it would be more useful than the long one that I'll never use). Are there sites any of you have used successfully that you can recommend. btw - I have the black and midnight blue bands in case anyone here wants to trade. I'm in SC.