First off, let me answer your questions.
There are no vendors in the current game that would be able to sell you a elemental Dagger.
However, the Blacksmith class can make you elemental weapons with certain materials. Weapons with elemental property also do drop, but I wouldn't bank off getting those since they are quite rare. A solid elemental weapon will generally cost you quite a bit, but post your IGN and ill see if I can send you in game mail.
Below is a list of great websites for this server:
1. Market Website
2. Database website with monsters
3. Spreadsheet of the items needed to craft elemental weapons
Post your IGN, and class and ill see if I can get back to you.