little bit of help plz

ive got 10minutes left on a bid for an sh101 currently at 220 quid

how much should i be prepared to keep bidding up to without getting ripped off, cos i dont really know the value of them

5 minutes now does no-one online atm know a decent value for this thing

£280-310 if you really want one

£220-250's a fairly typical s/h price

u got ripped off

nobody posted before the bid ended so i left it at 220 and sacked it off

to be fair, the guy that won it would have picked that synth up for 160 quid if i hadnt tried to win it, nobody else was there