Silly RO/DI question

[fortheloveofcrabs]

Hey, this is probably a silly question, but what's the difference between this:

http://cgi.ebay.ca/USA-110GPD-RO-DI-...QQcmdZViewItem

(incase the link doesn't work, it's a 110 GPD RO/DI unit that takes standard media for $120.00)

and this:

http://www.jlaquatics.com/phpstore/s...t_ID=ro-afb100

for $280.00?

Thanks.