Attn mommies of Colicky babes

Maura
Does anyone have a recommendation for a good swing, preferably one WITH a power source other than just batteries?  My son LOVES his swing and it's been a saving grace, but two issues. 
1. It's an old hand me down so it has like 1 speed that works well and it's Mach speed.
2. It only runs on C batteries and it costs $20 just for 4 of them and with as much as he uses it, I have a feeling we'll be going through A Lot of them!
Okay 3 issues
3. It's SOOOOO noisy!!