I recently purchased a few candlesticks... and discovered that some of the black & white coffee mugs that I've been collecting were a perfect fit.
You can use whatever mugs you like, just make sure they fit perfectly... especially if you plan on burning candles in them.
Pictured above (L to R) purchased from:
TJMaxx, Barnes & Nobles & Urban Outfitters
Above: Silver Mercury Glass Candleholders
Available at Michaels (in store only), or at www.worldmarket.com
I picked up the third one in the above photo at TJMaxx, which can be hit or miss.
Total cost for the candlesticks, mugs & candles... about $65.