With orders of $25 or more, Amazon offers Prime members 12 pairs of MCR Safety Single-Dipped PVC Plasticsol Gloves in Black, model no. 6300, for $2.41 with free shipping. That's the lowest total price we could find by $21. They provide liquid and basic chemical protection and are come in size L only.

Note that this item is sold as part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.