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I've gotten 4g AWG fully tinned "machine wire", which is very similar to battery cable, for under a buck a foot from eBay. There are a number of commercial wire suppliers who sell remnants and spool ends that way, and bargains to be had if you can take some time to wait for them to be auctioned off.
When you compare prices, bear in mind shipping can be steep on "metal". If you are planning more wiring work in the future--prices on 100' spools are always way cheaper than buying per foot. And your local stores--even West--might offer you a deal if they've also got a spool remnant, i.e. the last 15' on a spool. Always worth asking, just make sure of your measurements first.