While I am lucky in that Memphis has a really good hobby shop, there are always those kits that they either can't, won't, or are not able to obtain. In some cases where the kits are quite expensive it makes sense to go to the online stores. I have ordered from all of these suppliers and they have all been really good with prices, selection, shipping costs and getting items shipped out.
There is Sprue Brothers which is a good all round source.
Sprue Brothers link
There is Free Time which is similar but tends to carry more model ship items.
Free Time Hobbies link
A newer shop is Andy's Hobby Headquarters from Arizona. He has been carrying a lot of new big scale kits as well as a similar source like Sprue Brothers. In several cases he has managed to obtain kits that some of the others have not been able to.
Andy's Hobby Headquarters link
For SciFi and figures including Star Trek, Star Wars, Space 1999, and everything in that line is Cult TVman. He also carries aftermarket photo etch and lighting for the scifi kits.
Cult TVman link
I also collect high detail resin figure kits. They are all limited production and rather expensive, but unlike plastic kits they retain their value and appreciate in value with time AND appreciate in value with a high quality paint job. If you have an interest in them it is a bit of a bag of worms as it is mostly a garage kit hobby. The figures when done right are fabulous though. Here are a couple of examples.
The Penitent Bride
Ariel the Mermaid
Tinkerbelle
While I have these kits, I have not attempted to paint them yet. These are some of the premiere painters in the figure hobby. Jim Capone is well known at Wonderfest which is one of the big figure conventions that takes place in Louisville KY. I have the photos for my reference once I start the kits.
So what kits are you interested in Duck?