Actually, the savings in the first month alone pay for CF bulbs. Your wallet will thank you almost immediately. I was trying everything I could to conserve some energy around my apartment so that I could save some cash and getting these bulbs slashed my electric bill by 30 bucks in the first month. 10 more the second, an additional 10 the next month and 20 dollars the month after that. I only have three lights that don't use them and it's more laziness than anything else that I haven't replaced those.
And 8 dollars? Go to Sams where they'll sell you 8-10 of them for 12 dollars total. Hell, Home Depot sells them for similar amounts.
At $0.10/kwH, a 60W bulb will cost 0.6 cents per hour to operate. If the bulb is used ten hours a day, that's $1.80/month. Most bulbs are used a lot less.