You only need to use it for about a minute so probably a few batches; not sure though since I don't use one. For my aeration I just use an aquarium pump with hose and a diffusor stone from Walmart (this pump to be exact http://www.walmart.com/ip/Tetra-Whisper-Air-Pump-10-30-Fish-Aquatic-Pets/10291813 )cost me less than $20 for everything.
After the wort is cooled I'll siphon about half of it through a strainer into my bucket; will turn on the pump after I get about a gallon in. After I have about half or so into the bucket will then just dump the rest through the strainer. Put the lid on loosely to keep anything from falling in, but not to pinch the air line, and then go clean up while the pump aerates the wort for me. After about 30 minutes pull the air line out and pitch the yeast.
A trip to Wally World and $20 is certainly more my speed. I'm spending a considerable amount on this obsession errr... hobby as it is. My wife has been very supportive up to this point but's she's beginning to get that look on her face...