Welcome to PPRuNe,
Is there a shortage of pilots (ie licence holders)? No. Is there a shortage of experienced pilots? Generally, yes.
re job ads. Try these 3 sites. They seem quite good for jobs in the USA:
www.verticalreference.com/helicopterclassifieds/showcat.php?cat=3
/employment/pilotjoblisting.asp?iChannel=10000
www.helijobsonly.com/
HTH