If you are doing a large project—like lining a basement or building a massive Guinea pig enclosure—buying in bulk online is the most cost-effective route.
: The go-to for bulk shipping supplies. They sell corrugated plastic in packs (often 10 or 25 sheets). Their shipping is lightning-fast, though delivery costs for large sheets can be pricey. where to buy corrugated plastic cardboard
: These are specialty plastic distributors. They offer a wider variety of thicknesses (from 2mm up to 10mm) and specialty grades like UV-resistant or fire-retardant sheets. If you are doing a large project—like lining