I buy in bulk from a friend with a wholesale account and have collected tools over the years so my cost per bike is very low. If you shop around and wait to ship from across the world you could likely come up with something similar.
My usual cost in $CAD, however not every bike needs everything while some need more. These are decent quality replacements for flips but one can spend a lot more on a lot nicer things.
$20-30 tires
$8 cables and housings
$2-8 brake pads
$10 tubes and rim tape
$6-8 chain
$12-15 saddle
$5-15 brake hoods/new levers
$2-5 bearings, grease and paper towels
$10-15 pedals
$5-10 bar tape/grips
$10 misc hardware and supplies