Just because you have a tight budget doesn't mean you can't have some nice landscape lighting.  You just need to be a bit more creative.

A good place to get started with landscape lighting is with some small solar powered lights.  This are very inexpensive and easy to install.  You just stick them in the ground or other simple mounting method.

 My current favorites are called Grandviews.  You can buy 6 of them for about $70.  The batteries last for 2-3 years and the light and solar panel for many years. 

Installing them couldn't be easier.  You just stick them on the ground in a spot that gets lots of sun and you are in business.

You can easily move them around to a better spot as the seasons change. 

If you want a slight step up then the Champagne series might be for you.  They are stainless steel and weather very well.  The will provide light for as much as 10 hours under ideal conditions and 6 hours under typical conditions.

If you really want a bunch of lights at a low price the Innovision series might be for you.

Don't mistake these for the lousy ones you find at large retail stores.  These have the latest batteries,LED lights and solar panels. 

The downside is they don't provide as many hours of light from the same amount of sun as the slightly costlier models.  Also, after about a year in the sun they start to show some weathering. 

The way I work around this is to cluster them behind a hedge or bush to provide a nice back glow.  You can also use them as parts to make a light sculpture or other creative project.