$900? Maybe with the extra mags etc. And as I just banned two accounts for spamming with links from the site you listed I'm removing the URL.
Budsgunshop has the same gun for under $800.
Check around for cost of mags, as the holster goes unnamed, can't really comment on that. But find the cheapest place for mags, (typically Cheaper Than Dirt) and add that to the Buds gun and see if you can come in under $900 which I think you can.