The Guinea Pig Zone - Where the Passionate Piggy People Go!
Store Supply Warehouse
Hot12955 Enterprise Way
Bridgeton, Missouri 63044
1-800-823-8887
314-427-8887
https://www.storesupply.com/
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This is actually a warehouse designed for store supplies, but it carries both grids, connectors, and cable ties for a low cost. Here is a link to the actual grids:
https://www.storesupply.com/pc-12195-518-white-plastic-mini-grid-connector-30102.aspx
User reviews
The price for the items as well as shipping cost is exceptional, but the shipping time is long, especially since they don't always have items in stock.