I would seriously consider saving up the $$$ until you have it to do the suspension properly. Consider how much doin it cheap now will cost later. Think about what you are doing geometrically to your car. With only replacing the springs the following two things will occur:
1) Without Caster Camber plates it will not be possible to get a proper alignment therefore causing premature tire wear.
2) Keeping the stock shocks/struts will put extra load on them from the shorter springs therefore also causing premature wear.
When it comes time for state inspection you will have the burden of replacing the shocks/struts/tires and most likely adding a caster camber plate in response to the lesson learned so it doesn't happen again. Just some advice.
'"If you think having work done by a professional is expensive . . . try having work done by an amature!"