The initial cost for the 1st BSI was at a competitive rate. But we would like to help you further for the repeated borescope that you require prior to the H.S.I. Please find attached the quote for BSI with 1 engine and 2 engines (when u do the LH & RH engine at 800FH).
Alternatively, you might want to consider doing the H.S.I when the 1st 400 FH is due.