It is right that some switches were more expensive. That is because I told him a price for the stuff I've got in stock, not for stuff which I've got to order for him. Prices have changed over time.
However, I've lowered them, so the 990 extra clears are now 0.42 EUR or $0.55 like the rest of the switches.
The price for the extra whites is now 0.54 EUR ($0.70) as for anybody else.
I still need to get 101.83 EUR ($132.38) from him. Shipping for this order was only 4 EUR ($5.20), because I charge shipping only once, no matter how much is ordered.
I'm still waiting for the whites which should be delivered by the end of July.
Here is his price list, BTW:
$0.60 - MXBLACK (MX1A-11NN) - BACKORDERED
$0.60 - MXBLUE (MX1A-E1NN)
$0.60 - MXBROWN (MX1A-G1NN)
$0.60 - MXRED (MX1A-L1NN)
$0.60 - MXCLEAR (MX1A-C1NN) - BACKORDERED
$0.85 - MXGREEN (MX1A-F1NN)
$0.65 - MXWHITE (MX1A-A1NN) - BACKORDERED
$0.85 - MXGREY (MX1A-D1NN)
$0.85 - MXDARKGREY (MX1A-21NN)
$4.25 - MXLOCK (MX1A-31NN) - BACKORDERED
He got for switches (according to his pricelist):
((3939-304-22-2)*0.6+0.85*(304+22)+4.25*2) == $2452.20
He paid so far:
1608.68 EUR == $2091.28
He still needs to pay:
101.83 EUR == $132.38
Under the (false) assumption that every switch costs only 0.42 EUR ($0.55):
(3939*0.42+4)*1.3 == $2155.89
So he has to pay $67.77 more than he thought.
So he should have 2452.20-2091.28 == $360.92 left at this point.
After paying the rest, there are still $228.54 left.