$80 is the going used price. Buying used look at the pump included,
old style, grey-blue and red, with very good compression, but brittle plastic, source of MSR pump failure complaints.
current pump, all red, reinforced plastic, no personal experience with breakage from mine or other associates, not as much compression (shorter pump stroke).
About as good used you will find,
Ebay Dragonfly used .
Pumps are Dragonfly specific as they use a larger pump to fuel line fitting with a disconnection valve.
$80 will buy mine.
butthead