While building my own P3Steel ordered bunch of frames and some are still available. They are cut using P3Steel V2.5 DXL file by AndrewBCN (http://reprap.org/wiki/FileRUSA_i3_steel_3mm_lasercut_2.5DXL_e_irobri.dwg.zip)
Material is 3mm S355 structural steel. No further treatments, straight from laser cut.
Price of a single frame is 60e plus possible shipping costs.