Are you really going through batteries quickly? I play A LOT and only replace about every 6 months not because it goes dead, but because I feel like "it's time."
I play quite a bit as well and 4 out of 5 of my basses are Ibby SR's, and I only go through 2 batteries per year ... maybe 10 months.
I get the 4-packs of Rayovac Alkaline ... they're considerably cheaper than Eveready or Duracell, and last just as long. That's less than $3.00 per year.