How to show equal numbers of items from each seller

Hello,

we develop a special webshop with different sellers like ebay.

We have sellers with 10, 1000 and 10000 articles.

When I search, and response is 20 results, then the seller with 10 articles will probably not shown on the first page.

is there a possibility to order the results according the sellers like this:

item 1 - seller 1
item 2 - seller 2
item 3 - seller 3
item 4 - seller 1
item 5 - seller 2
item 6 - seller 3
item 7 - seller 1
.
.
.

Thank in advance for help.