S.B.
I can totally sympathize! I had a go round with lice when I had a home daycare - my daughter brought it back with her from camp. We found out when we took her for a hair cut.
I did get rid of it in one day (longest day of my life, though). Here is what I did:
I treated everyone (even myself and my husband) with real mayonnaise (NOT miracle whip) and put shower caps on our heads to let it "set". While that was "cooking" on our heads, I vacuumed EVERY SINGLE THING IN THE HOUSE. Hard floors, too. Every piece of bedding and all pillow were washed in hot water. Rugs, too. All stuffed animals were bagged and put out in the shed for 30 days. All plastic toys were rinsed in bleach/water mix. I vacuumed both vehicles and sprayed them with lice killer (this is the only place I used chemicals). Make sure that when you vacuum, you take all the bags (or empty the canister) outside and throw them in the outside garbage. When I took the shower caps off all of us, I went through everyone's head with a nit comb. I spent no less than an hour on each person's head (the kids watched movies while I did this). The most important part is this step, so get clips to move sections of hair aside to work on one piece at a time.
The whole process cost me less than 30 dollars, but did take one entire day (about 15 hours start to finish). I was completely lice free at the end and although it was one of the worst days of my life, it would have been worse to do a "not so good" job and then have to do it all over again a few days later.
Good luck!
ETA: Forgot to add - throw out every comb, brush and hair clip (you could probably clean if you wanted - I just threw them and replaced). Also, wash jackets, hats ANYTHING your heads come into contact with as well.