The sale prices are:
Apple iPhone 4S 16GB $359.99 (reg $399.99)
Apple iPhone 5 16GB $404.99 (reg $449.99)
Apple Phone 5 32GB $494.99 (reg $549.99)
Apple iPhone 5 64GB $584.99 (reg $649.99)
At these prices the 16 GB and 32 GB iPhone 5 are $45 and $55 less expensive respectively than the equivalent iPhone 5C models. Choosing the the iPhone 5 over the 5C, which has the same internals as the 5 in a colorful but less expensive to manufacture plastic case, seems like a no-brainer.
The iPhone sale ends 10/21 and is on the Virgin Mobile Website only, not in stores.