www.ritzcamera.com has maybe three colors of the dew drops...you have to search for them....but they are only $4.19 or something like that.
I got some on Ebay last week for $5 a bottle (normally $6) as well.
7kidscollegefund.com has them...I think you still get 10% off with the code SCS10.
Ucutathome also has most colors....sometimes I add one to my order and it's basically free shipping that way since I am already buying.
And I use the Tombow Multi Adhesive...little green and white glue bottle...when they are dry you can't pick them off without peeling the paper...yep, I tried!