I haven't used them, but there's a lot of online stores that sell cheap Ergos. They are counterfeit. Ergo has a price point that stores have to stay at unless they run special deals with a certain vendor like they have with Costco and babysteals in the past. If you're still wondering, Ergo has a list of their vendors on their website you could check out.
I just came across this site too and then thought it was "too good to be true." I am not going to order from them, just seems too wierd. I have decided just to buy the ergo from a local business and support local..I feel good about that too!
Re: Babycarrierclearance.com
take a look at this page from the Ergo website... it talks about all the counterfeit websites that sell Ergos... etc.
https://support.ergobaby.com/entries/21285678-counterfeits-and-suspect-websites