With a list of potentials I would then start shopping around.
I've seen kits with a price range of over $30 in difference depending on the store.
Places to start looking (places I have bought from) would be Starship Modelers, CultTV Man, Squadron, Tower Hobbies, Mega Hobby, Hobby Link Japan then start doing searches in google for other on line shops.
Some Stores also have sales on items and or give discounts for purchases over a certain amount.
Don't forget the cost of shipping, some sites may offer free shipping if you spend over $100.
Fine Molds can usually be found on the Starship modelers, CultTV Man and HLJ sites the other sites I listed will carry the Trek, BSG and other assorted Sci Fi sundries.