have a local suplyer, Better Metal, I dont know where you are but these are resonable priced and collect if you can.
Better Metal Stores Ltd
Unit A2 Salcombe Rd,
Alfreton,
DE55 7RG
I also buy from M-Machine Metals They have an online catalogue which you download and call for informayion as they are very helpfull and will cut other sizes as well if asked.
M-Machine Unit 6 Forge Way, Cleveland Trading Estate, Cleveland St, Darlington DL1 2PJ
David