Actually you can get most of the parts from DigiKey.
Not included in the list is
- the whole battery stuff (LiPo or AAA battery and protection circuitry) (e.g. Batteryspace),
- the two VCOs (Minicircuits),
- the two SXA-389B amplifiers (RFMW)
- and the assembly material (standoff and screws)
Furthermore the placement of resistors R8 and R9 (for setting the maximum gain for VCO1 & 2) is optional
and the notes for building the power supply part recommended to leave out ceramic capacitor C20, so they
are also not in the list.
You only have to add the two resistors R1 and R2 with the desired values for the low battery detect and
headers JP1 and JP2, but that should be no problem.
I hope that there are no mistakes in my list. Maybe you should doublecheck it - just to be sure.