There are a large number of hotels in Philadelphia. We provide a short list of hotels which are relatively cheaper or are convenient. 

On Campus:

 1. Harrison College House (3910 Locust Walk)-  This is a residence hall which is located two blocks away from the meeting site. You will have a single room in a suite. Basic linens and towels are provided. We will provide you soap and shampoo.

Rate: $50.
Telephone #: (215) 898-9319

Center City Philadelphia:

 2. Radisson Hotel (1701 Locust Street, bus 21 or 24, 10 minutes)

 Telephone #: (215) 735-6000
 Rate: $125.50 after tax

We have blocked 40 rooms per night. Please refer to "The OBayes Statistical Conference" or use the promotional code BSC when logging on their website to get the special rate.

 3. Club Quarters (1628 Chestnut Street, bus 21 or 24, 10 minutes)

We have blocked 35 rooms per night with a rate of $132 tax included. They are guaranteed until May 4th. However if you book the room yourself you may find even a cheaper rate.  (Group Code: UPEN09)
Telephone #: (215) 282-5000

On Campus:

Inn at Penn (Hilton, 3600 Sansom Street).

It is a very nice hotel. Telephone #: (215) 222-0200

The Sheraton (3600 Chestnut Street). 
 Telephone #: (215)-387-8000

In addition, here is a list of reasonably priced hotels that the attendees can reserve individually. 
The rates for these hotels will fluctuate:

 Crowne Plaza (18^th and Market Street).
 Telephone #: (215) 561-0747

 Windsor Suites (17^th and Parkway).
 Telephone #: (215) 981-6800

 Hilton Garden (11^th and Arch).
 Telephone #: (215) 923-0100