I'd be astounded if the OP isn't including the price of the sights in the $110 per Glock.
I recently removed some Trijicons from a friend's G19 and replaced them with Ameriglos. The lamps were pretty dim on the Trijicons. Sent them back to Trijicon and they replaced all three tubes for $57 and paid for return shipping.
I can get new Trijicon sights for Glocks @ about $93. I'd prefer Ameriglos, which I get for less than that, and Ameriglos use Trijicon tubes. However, I'd think that $110 each, installed, in Miami would be a fair price.