Just ordered the empty rack, cost : 70.79€
Vumeter ordered : 30€
 If my numbers are correct, the total cost for the project is gonna be :
Serpent Audio : 110€
Modushop Rack : 71€
DIYPartsSupply : 30€
Mouser : 292€

So, wire and solder aside the project would cost me exactly 503€ for the quad version. This is if I don't have too much surprises, but I guess there always are some surprises !!

Just received an email of Serpentaudio indicating my order is shipped. So it only took 2 days to be shipped (which is great considering the timezone difference)