Best place to order/get Massivore pellets?

I'm looking to see where you guys order your massivore pellets. I bought a small bag to make sure my Giraffe Cat would eat them, and he's finally coming around. But a 4 ounce bag here costs 16.99 and at his size if i fed him those like he eats his other pellets, it would be gone in 2 days. Thanks for any advice, or help.

Just for kicks, i went to petsmart looking for them, and asked the "fish expert" :

Me: Excuse me, do ya'll have Massivore Pellets?

Expert: Um, whhaaaa?? (mouth hanging open and very confused looking)

Me, Trying not to crack up: Yes, Massivore Pellets

Expert: Well what you tryin' to feed?

Me: A catfish, so do ya'll carry them or no? (why the heck does it matter, just tell me if you have them or not.)

Expert:uhh... (proceeds to walk to the same section I just came from to read the labels I just did)...so what kind of catfish.

Me: a giraffe cat. (starting to get annoyed as his phone will not quit playing some stupid ringtone that sounded like two lions F***ing.

Expert:whoaaaa. dude thats like, kinda a big fish right?..... Oh, hold on a sec, Hello, no whats up dude? (walks off on his phone)

I just walked out after that. There are two people that work there, that actually know their stuff, so I don't count them as idiots at all.

Thanks guys. I will check out both sources. I know my LFS sells that size ( i think) for $45. I need to go back and look at the size. There were only two sizes. Really small, and really big lol.

Nope then that is definitely not the one I saw. Thank you

Awesome, thank you. I was finally able to find out who you were talking about. I will get in touch with him. Thanks again.