FYI, for anyone following along who didn't already know:
Did some googling
; rumor has it that BeachCamera is the parent company of BuyDig -- they are one and the same (and I assume they're using propietary software, they're not resellers under a third company).
My guess is BeachCamera/BuyDig can be used as a benchmark for the lowest price. In other words, it's probably rare for anyone else to have a price lower than BeachCamera/BuyDig. Reviews for their customer service are mostly positive (although there were a few complaints as are with every company -- google for more info).