There are two things I need.
A cheap, but still good, Chroma-Key background.
I'd rather it be good than cheap though, btw.
And, preferably free, Chroma-Key software.
If the background you suggest comes with the software, this part can be ignored.
Unless the software sucks.
But, I'd like to know where I can get free Chroma-Key software anyway, to take some pictures in BL.