well here is what i think would be the bare minimum
spoke shave or a wood rasp for the neck- 8- 15$
small nilon faced hammer for frets- 15$
three files; one for frets 6" triangle, one for neck half rasp half smooth-12$ set of jewlers files-12$
a cheap router- 50-80$
lots of sandpaper
tightbond wood glue
lots of clamps, c-clamps, quick grip clamps, any kind
a good ruler
a neck caul
a dremel if your doing inlays-35$
a drill and assortment of bits
that would probably work for ya, and you can get most of this stuff at lowes or home depo and also check out www.harborfreight.com they have a lot of tool really cheap,there not the best tools but if your on a tight buget it will get you started. then if you like building you could invest in better tools down the road.
good luck!