Goodgram via eBay offers the Goodgram Bed Bug Proof Zippered Vinyl Mattress Cover in a variety of sizes, as listed below. Plus, free shipping applies. That's a savings of up to $13. The sizes:
  • Twin for $11.99 ($13 off)
  • Full for $12.99 ($12 off)
  • Queen for $13.99 ($11 off)
  • King for $14.99 ($10 off)