With orders of $25 or more, Amazon offers Prime members the Pentel R.S.V.P. Medium Ballpoint Pen 8-Pack
, model no. BK91CRBP8M, for $4
with free shipping
. (Non-members can spend $35 to qualify for free shipping.) That's the lowest total price we could find by $5.
Note that this item is part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.