Digital BW, The Print

I spend loads of time in PS making the image look just the way I want
but when I print it, it's up to 30% lighter than what I see on screen.
So I adjust the screen image to be 30% darker and it looks lousy on
the screen but it's "closer" to what I wanted on the print. Still I
feel I'm losing something doing it this way. I also have no idea what
people are seeing on their monitors when I email them a sample image.
(no complaints to date but it concerns me.)

At the moment I just don't have the funds for an expensive calibration
software. Anyone have experience with the cheaper Spyder
version.."Spyder 2" I think it's called. Are there any other options
out there?

Any response would be most welcome as I have a show coming up next
month and I'm at wits ends.

Thanks,

Tim