Common use and function	Early model	intermediate models	Current model (as of 11/2016)	Cost estimate
B&W, small work-group	P2055	M401	M402dn	HP LaserJet Pro M402dn Monochrome Printer (C5F94A) Amazon: $169.99 (12/9/2016)
B&W, medium work-group	P3005	?	M506M506dn	HP LaserJet Enterprise M506dn Monochrome Printer (F2A69A) $375.00 Amazon, free shipping, not Prime (list $750?!) (12/9/2016)
Color, small work-group	CP2025	M451	M452 ($298.95 at Amazon, 12/2016)	~$300 (dn model, though?) at Amazon (12/9/2016)
Color, medim work-group	?	M551	M553	HP Color LaserJet Enterprise M553dn w/ HP FutureSmart Firmware (B5L25A#BGJ) Amazon: $628.00, prime (12/9/2016)

Others, usually "deals'

12/6/16: Samsung ProXpress M3870FW ($399.99-$100 savings = $299.99, Ends 12/31) *

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