From the Ilford Ortho datasheet:
Safelight recommendations
Either total darkness or use an ILFORD 906 (dark red) safelight illuminated by a 15 watt bulb. As a precaution
against fogging and resultant reduced image contrast, a minimum distance of 1·2 m/4ft between the safelight
and the working area is recommended. For best results, keep safelight exposure to a minimum.
The Kodak GBX-2 is the equivalent of the Ilford 906.
B&H carries an 8x10 Ilford 906 of $159.95. You may find it cheaper somewhere else. I'd check eBay too.
Fumbling around in the dark is free.