While this is more expensive at a hair under $200 for open frame and $208 for enclosed, here's a nice little +/- 24v PSU. If we can get 10 orders, they drop to about $150. Granted, it's a lot more expensive than wiring up a couple of single output 24v supplies, but for the electrically challenged like myself, here's a clean, factory built option:
SRW-115-2004 http://www.psui.com/pdf/srw115.pdf