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Dear Philip,
It sounds like you have a problem with your electrical system. One possibility is that the line voltage is too high, causing the ballasts to fail prematurely. You can check that with an AC voltmeter. If it is higher than 120 VAC, the power company is required to adjust the voltage for you.
Another possibility is that there is a wiring fault in your home. An electrician can check for excessive ground currents, etc.
I've never had a CFL that lasted less than 2 years in normal operation, even those that were in semi-enclosed or recessed fixtures, and I've had many that have lasted four to six years.
Also, you should be able to buy CFL for much less than $7 per bulb. Home Depot typically sells 4-packs of the 60-watt and 75- watt equivalent CFLs for under $8, and 2-packs of the 100-watt equivalent bulbs for around $7. These are N-Vision bulbs that are highly rated.
Here in southern California, I can buy a 4-pack of 75-watt or 100- watt equivalent CFLs for $2 (that includes a discount provided by Southern California Edison.)
Mark