I went from lots of allergy related sinus issues to hardly ever having any issues just by using one of these daily.
http://www.neilmed.com/usa/sinusrinse.php
Much more effective than the Neti Pot IMO.
My yearly consumption of Zyrtec is down to about 10 days a year now due to this. Only reason I take the meds now is just for my eyes on days with excessively high pollen counts.
The Costco warehouses out here sell a pack with two bottles and 250 saline packets for $15.99 (Making it cheaper to buy a new jumbo kit rather than just buy refil packets at $11 for 100).