Batteries can be had cheaper in Europe from Fogstar UK:
so I suggest lowering your price.
Also, what brand are those caliber mounts? Are they for 63mm or 50mm motors? May I see them from the other side please? (want to see how they mount on to the trucks) In any case, asking 80 per each is pretty steep, Boardnamics mounts with idlers + shipping from USA + taxes cost less.