We are currently ordering our Oligonucleotides from two vendors.
Integrated DNA Technologies (IDT) through the Molecular core has been for a while been providing oligonucleotides for the UCHC research community. We have been very happy with IDT's quality of service.
In Summer of 2008 we also began providing oligonucleotides through Sigma because of requests from PI's who have had a good relationship with them and there pricing was very competative.