[davemc]

If willing to convert to 45's, take a look at this one sold by AES (P-T143).

Specifications
Rating: 350-0-350 V, 70 or 90 mA (if 5 V winding is used with 2 A rectifier)
Windings: 5 V, 3 A; 2.5 V, 7.5 A; 2.5 VCT, 3.5 A
Mounting Centers: 2.75" x 2"
Weight: 4.6 lbs.
Overall Height: 3.12"

The 2.5 volt windings can be paralleled or you can split up the 2.5 volt string into 2 strings. Might take some engineering to use it (45 bias), but at $64.25 you can save a little (on the other hand, getting 45's may cost you the difference vs. the solution suggested by Ron).

Oh well. Maybe waiting for a junker chassis is the best way to go!