I want to get an AMNPS for my MES30 and was wondering if it is better to get the package deal with the 4- 2 lb. bags of pellets for $54 or to just buy the AMNPS and a big bag of pellets separately? It seems like the package might be a good deal, but I'm not sure how far a 2 lb. bag of pellets goes with the AMNPS? Thanks in advance!