So far ?
I've spent :
Fl Studio - $200 ( got two discounts and got the producer edition of FL through upgrading for roughly that much)
Midi Keyboard - $60
88 Key Yamaha Keyboard - $200 (pawnshop come up

)
Guitar - $250, was discounted because the box was opened.
Audio Interface - $25 (Pawnshop come up

)
Blue Yeti Mic - $200
Pop filter - $25
Still need :
Bass Guitar
Monitors
Stand for my 88 key
More Powerful Laptop (I'm running a cheap one right now)
Physical Drum kit
Scarlett 8i6
I save where I can so I downloaded several Free Drum packs and VST's.
I've got Synths that were totally free so that means that just about any that were available
on the net I've downloaded.
Digital Drum genre specific kits (Pop Rock, Funk, Jazz), 808's, 909's, Hip-Hop drum kits etc.
Digital Piano's (Rhodes, .sf2 files and so on)
Digital Pedals, Amps and Cabs as well.
And I use all of the stock software that came with Fl studio as well.
Depending on what you're trying to do, your set up can be really cheap and barebones
or increasingly expensive. I'm trying to entirely self produce and self release an album
as a personal goal, so as my vision for that album grows, what I need grows.