GD and IE are often out of stock... (I don't need micro-plates anyway...was just looking around)
IE $24 for 2x1kg plates, $30 for 2x2kg plates
IE $120 for 0.5/1/2/2.5/5kg no stock
GD $60 for 0.25/0.5/0.75/1.0kg no stock
really only need 0.5, 1 and 2kg plates (to make up 1/2/3/4kg lots) maybe 0.25 to go in 0.5 amounts (asuming you have the normal 2.5kg plates already)
30 washers = $45 + 0.25/0.5/1/2kg pairs (plus effort to drill them, and maybe tack weld together)
of course the other option is to just drill/grind cheap 1.25kg and 2.5kg plates for the 1 and 2's
(at say $2/kg)