Buy a welder cord if you figure you need one but do yourself a favor and buy 50 ft of 10 vs 25 0r 30 of a cord you will never need and get one that will be the last cord and could actually prove useful.
Who is coaching this deal is doing you a dis service including some on this forum that know just enough to be safe but a little short giving practical advice.
Same for the OP, should have asked,,, what cord do I need? A full welding shop with 252 running wide own only uses an 8 and the OP has a 211 but feels the need to prepare for nuclear war.
The 211 runs at 100 ft of 12, a 10 gives a little better mechanical connections at plugs and recepts and is still good for any machine that comes factory cord and plug at home.