Here. Apparently they're $5 a piece! 150 units will be pretty expensive... maybe you could ask for a discount?
Another option would be to buy used games nobody wants for $2 or less, and them remove all the boards and labels yourself. Most will probably not look like new, though.
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Perhaps you could get an alternative that looks like one but is something else.
That's an interesting alternative... You could make a mold from a real cart and use some cheaper material to produce copies. An art student or someone who works with props might be able to help you with this.