I've seen some nice evergreen type bonsai at stores, English Gardens have some, they are good to get you in the hobby, but those have to winter though, a good place to buy is go to a Bonsai show.
We had a nice store here, I got to know the owners, one day I go there and it's empty. Not sure what happened, he would trim and wire my fig, wich got too large and now I'm trying to do it myself. lol. Not sure on this. My plant from Hawaii isnt really good for bonsai, but oh well, I've had it since 1984. 1999 on the fig, my daughter was born that year, it's getting old with her. Lol