I already checked at the Friesen Electric in Abb. It has many 35w-150w ones but none 250-400w. The store will order some and price is among $20-$30. The problem is it takes 2-3 weeks.
To be smart enough, i rather put $100 more to buy
one Icap dual 250w electric ballast than spend 2X $75=150 for ignitors alone.
Check this out http://cgi.ebay.com/250-Watt-Metal-H...item1e5bcf4684