Well, I found 7 Aqua Connect 11K bulbs on ebay the other day for $18 each. I did a little research and found good review on these bulbs. So, I ordered all 7. The seller emailed me later and said he actually had 8 in stock and the threw in the 8th bulb for free.
So, with 8 Iwasakis, 8 Aqua Connect and 6 Reeflux that I have from a previous purchase, I should be good on bulbs for about 10 years