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Two suppliers can quote the same 0.25 kW frame and be a long way apart without either of them being wrong.

DRG MOTOR | Sales of High Efficiency Electric Motors

What separates the figures is written on the nameplate rather than in the offer. The efficiency class comes first: a motor graded one step higher carries more copper and more steel, and metal is what the difference is made of. Then the housing, because a cast iron body weighs more and costs more than an aluminium one of the same rating. Then the mounting, since a flange frame carries machining that a foot frame does not. Then the quantity, because a single unit is priced off the shelf while a batch is priced off a production run. A cheap line usually means the lowest class in the range. On a machine that runs a few hours a week that is a reasonable purchase. On one that runs every shift the saving is handed straight back to the electricity meter, generally inside the first year, and after that the cheaper motor simply costs more every month. The other thing hidden behind a figure is how long it stands. Copper moves, and quotations on the larger ratings of the 0.25 kW to 355 kW range carry a validity date for that reason. Asking when a price expires is as useful as asking what it is. For repeat buyers the answer is usually an agreed specification held at a fixed figure for an agreed period, which removes the re-quoting entirely.

Send the rating, the speed and the mounting to the numbers above and say whether the motor is a one-off or part of a repeat order; the figure that comes back will state which class it applies to and how long it stands.