These were the ones that caught my eye. Please let me know what you use, and how these products rate.
http://catalog.jetpilot.com/product.html?catID=47&prodID=137
http://catalog.jetpilot.com/product.html?catID=46&prodID=132
http://catalog.jetpilot.com/product.html?catID=47&prodID=277
http://www.blowsion.com/detail.asp?PRODUCT_ID=HEBE201
http://catalog.jetpilot.com/product.html?catID=47&prodID=137
http://catalog.jetpilot.com/product.html?catID=46&prodID=132
http://catalog.jetpilot.com/product.html?catID=47&prodID=277
http://www.blowsion.com/detail.asp?PRODUCT_ID=HEBE201