Woot offers Vegtrug DIY Medium Cedar Barrel No-Rot Base with Drainage for $22.99 (orig. $52.50). Free shipping for Prime Members.

Product Description:
Adorn doorways, walkways, patios, and decks with these stylish and unique planters. The plastic base helps eliminate wood rot, drain excess moisture, and allow air to flow to roots. From VegTrug.
Whiskey/wine barrel design

• Tongue-and-groove cedar slats sit in no-rot plastic base
• Cedar construction
• For outdoor use
• Assembly required
• Measures 13"H x 18"Diam
• Imported