I only have $100 invested in my spider and normal female combined!!
I got my female almost a year ago as a free snake from a girl that was leaving for college. Although she turned out to be more of a rescue. She was dehydrated and extremely underfed -- she only weighed in at 680g at three years of age. She is now around 1600g!
I picked up my spider a year ago for only $100. He was the last of a clutch that the breeder was trying to get rid of. He was the runt (only weighing 98g at 6 months of age) and a bit of a problem feeder. Since I have had him he hasn't missed a meal, is up to 900g, and is now breeding.
I was thinking around the $200-250 range for the spiders as well.
Good luck!