try something like this.
select item_num, pack, item_size, old_desc1, manufacturer_item_nbr, brand_name, opco_desc, flag, COUNT(distinct bid_price_old) as bidCount
from #mx
group by item_num, pack, item_size, old_desc1, manufacturer_item_nbr, brand_name, opco_desc, flag
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Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
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