Seriously, unless you're buying in massive, massive quantities--like, say, over 100 bulbs--just buy bulbs at a place when you're out shopping. If you want, wait for sale. If you don't want to wait, don't. Just don't pay more than $9 for a 4 pack of 23w bulbs. Don't worry about it.

The fact is, the amount of money you would "save" would be, at best, pretty small (unless you buy, like, 200 bulbs at a time). If you went to Wal-Mart of Home Depot or Lowe's, you could probably find a 4 pack of bulbs for around $8. Four of those four packs would set you back $32, and you'd have over 360w of light power. That's a lot. Waiting, and shopping around, or driving out of the way to get a four of those 4 packs of bulbs on sale for $6.50 would save you a total of...six bucks. Not worth the hassle, IMO.