Minimum quantity and base-level price

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Hi,

I'm looking for the following features:

1. A minimum quantity must be ordered before people can check-out
2. A fixed starting price that will be added, no matter how many articles are ordered.

let's say someone wants to buy 2050 sweets. They can only be ordered with a minimum of 1000. Also, the making of some custom packaging would cost an additional USD 250, no matter how many sweets are ordered:  

Custom packaging development: USD 250
2050 sweets (MUST be > 1000) : USD 500

Does something like that exist? Would it be hard to make a hack/contribution?

Thx,

Richard.