Check the Dollar Tree - if I remember correctly, they may have them! Otherwise, check on Oriental Trading Company, they have pillar candles that you can buy in bulk!
I got my candles from Yummi Candles. They weren't colored but I do remember seeing a lot of color options, plus you can get sets that come with the corresponding vases. I got about 100 candles with all the matching vases for $106.
Rent vases if at all possible to avoid the shipping costs of heavy fragile glass. A local florist or party rental store will do this easily. Otherwise get the vases locally at Walmart.
