Personally I would prefer to have a site with frags and the asking price listed and be able to purchase at the time or order at a set price for the future delivery if more need to be grown out. That way one can place an order and know what they are getting, you only get the pieces you really want for your set up and the vendor gets full value.
If the vendor is doing auctions to try and increase his gross then a sealed bid system often brings in bids over retain/estimated value.
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