This is another long term project.
When I purchased the back issues for Miniature Wargames I found that they also produced the rules for Hammer's Slammers. These rules are based around the novel by David Drake, I recommend them as a good read. The rules are available from miniwargames.com.
Thankfully I don't need to buy my figures from the U.K.. Eureka Miniatures (www.eurekamin.com.au) stocks them under the Star Grunts range, and they are readily available, and at a good price. I've made a small purchase to sample the vehicles (mainly) and troops. I should know this week if the investment will reap a return.