We need filters for the number of pieces and unit price

[glicuado]

For example, in supplements, we cannot search for presentations of 200 capsules or for the unit price of the capsules.

The number of pieces filter could be a range selector. This would allow buyers to specify the minimum and maximum number of pieces they want.

The unit price filter could be a text field. This would allow buyers to specify the exact price they are willing to pay.

[mam98031]

Those are good suggestions, not sure how the rest of us can help you with that.  You need to contact Ebay directly and suggest this.  We are all just sellers like you.