Walmart offers 2x4 Basics Firewood Rack System, Black for $5.21 (orig. $11.97) with free store pickup.

Product Description:
Unlike pre-made racks or shelving units, the 2x4 Basics Firewood Rack gives you the freedom to build a rack that's exactly the size you need. Simply add 2x4s (not included) and create any dimensions you choose up to eight feet wide and four feet high. The Firewood Rack is easy to assemble. Only straight, 90-degree cuts are required, no miters or angles and all the necessary hardware is included with the kit. Once the assembly is finished, the Firewood Rack will measure 16 inches deep (40 centimeters), which is plenty of room to hold the wood needed to stay warm. The Firewood Rack is made of durable and maintenance-free structural resin and features all-weather components that resist wear and tear. It's also versatile enough to accommodate any design. And by combining additional Firewood Rack kits, a structure with multiple layers or sections can be created, which will allow for separation of larger logs and kindling. 
2x4 Basics Firewood Rack System, Black:

• Unlike pre-made racks or shelving units, the 2x4 Basics Firewood Rack gives you the freedom to build a rack that's exactly the size you need
• Simply add 2x4s (not included) and create any dimensions you choose up to 8' wide and 4' high
• The Firewood Rack is easy to assemble
• Only straight, 90-degree cuts are required, no miters or angles, and all the necessary hardware is included with the kit
• Once the assembly is finished, the Firewood Rack will measure 16" deep (40 cm), which is plenty of room to hold the wood needed to stay warm
• The Firewood Rack is made of durable and maintenance-free structural resin and features all-weather components that resist wear and tear
• It's also versatile enough to accommodate any design
• And by combining additional Firewood Rack kits, a structure with multiple layers or sections can be created, which will allow for separation of larger logs and kindling
• Lumber not included

Thanks Rich123