Talk to ndrew2505. his site (modwerx.com) says he only has 56 in stock right now.
but for an order that big he can prob order another shipment, i think it takes him like 4 days to get them.
and with an order like that he can prob give you a pretty nice deal on the cost.
For that big of an order you might want to get sleds directly from the supplier, IIRC they cost somewhere around $5 - $6 a piece plus shipping from everybody's main supplier.