We have used Island Birds three times and Air American once. Both were very pleasant experiences.
My memory tells me between VG and sju was $1,125 in February (island birds) and $825 between STT and sju (Air America).
But we only had 3 people. I think our flight for 5 was over $2,000 between sju and VG a couple of years ago. The upside is we can fly to sju much less expensive than stt or eis.