Posting sources is against board rules as this board is supported by a store. However, I did get mine from that big auction site that begins with an E. Also, keep an eye on the classifieds section of the board as they appear there once in a while.
dont know never even bothered with the small one however the reason i went right for the better brand and bigger size pump was do to lots of reading. everything i read said to go with the mag or maxi. even aquaC themselves said the better pump option really brings the skimmer to life.
some remoras come with the rio which IMO is a junk pump and your asking for trouble. some love them but i have never owned one that did not give me problems.
i pull out tons of very thick and dark skimmate a few times a week