Has anyone replaced the catalytic converter on their sedona themselves.

>From what I am reading the problem with my 2002 Kia Sedona is most
likey related to Oxygen sensors, the catalytic converter and possibly
the fuel filters. Now I see the converters run from 60 bucks to clsoe
to 700. So I think I'll be installnig that myself to avoid a huge
markup from the shop. But I am having a hard time finding one online.
One site had 5 pages of them with some requiring possible vehicle
modification. Anyone know where to get a cheap converter that is an
easy swap for the oem part?

Thanks.