Ebay offers Sun Joe SJG-EXT2510-RV Generator Series RV Power Cord for $55.20 (reg. $79) free shipping.

Product Description:
Connect your motor home, trailer or vehicle with the Generator Series 25-ft RV Power Cord by Sun Joe. Ideal for use with most portable generators, this heavy-duty RV cord is designed for use with RVs, campers, trailers and vehicles at campgrounds, motor parks, and recreational areas. Featuring a TT-30P plug and TT-30R receptacle, Sun Joe is the perfect fit for use with most portable generators. Constructed from a durable, fully-insulated, non-toxic, high-grade PVC jacket material, it's flame, water, and oil resistant for a long-lasting, safer connection. So, POWER UP with the Generator Series 25-ft RV Power Cord by Sun Joe®. GET EQUIPPED®.