I went through and cataloged a list of equipment required for completing Foundation 3. A lot of this is already required for F1/F2. Please let me know if I missed anything or if you've come up with any clever substitutions:
FL:
Rings will be sufficient for the front-lever work; p-bars can be used as well.
FL->iM:
no new equipment needed
sPL:
no new equipment needed
sPL->iM:
no new equipment needed
SL:
Stall bars (not new, but it's pretty much impossible to substitute for something else now)
SL->iM:
need some light weights (not new)
MN:
Need p-bars (not new)
MN->iM:
Need a bench and a heavy weight (not new)
Stall bars (not new, but it's pretty much impossible to substitute for something else now)
SLS:
need heavy weights for lunging (not new)
SLS->iM:
need light weights and a place to do arch ups (not new)
HBP:
box/other support at ~rib height for box-headstand pushups
low (~4-8") supports (2x) for elevated HeSPU
parallettes high enough for HSPU
parallel bars or a dip station for planche-dips (not new)
HBP->iM:
- short strap/belt for PE21->iM
RC:
bar with room for pullovers
RC->iM:
bungee (not new)