Well, here's my "guestimate":
took the s/h of the Q-rau as middleground s/h costs
and added 19% Tax over everything
on some lone 1/60, customs didn't hit me, but most were 1/48's where s/h was at least double that of the Q-rau
against todays currency (in the beginning a 1/48 cost me €120 a piece, nowadays they're less than €100)
the figure I calculated on HLJ's prices (where everything was bought)gave me a rough €3500
More realistically, I probably went over €4000 (= $5200)
Then to think I only miss the 2 non-canon GPB's and the TRU 1/60 CF