Anyone know where I might find such a thing?
Check out http://www.webtatic.com/packages/php53/ if you are on CentOS 5 it has 5.3.10
Another fix for the Dag Wieers repository...
http://dag.wieers.com/rpm/FAQ.php#B
Install this and you can just yum install it (as well as a ton of other stuff)..
I use remi collet, at the moment he has php 5.3.x but will upgrade to php 5.4 on 15 december 2012
The url is http://rpms.famillecollet.com/