Trouble finding "Expander" for Adaptec 5405

[nowwhatnapster]

I can't seem to find these "Expanders" that Adaptec says will allow the 5405 raid card to accept up to 8 devices. Anyone know where I may find one?

After a few more hours of searching I stumbled across these Chenbro "Sas Expanders" This seems like what I'm looking for... takes my 1x mini-sas and expands it to multiple mini-sas, which then plug into whatever backplane im using.

http://usa.chenbro.com/corporatesite/products_detail.php?sku=74 goes for $230, which probably a little bit more than the cost of selling my 5405 and upgrading to a 5805