I am pretty thrifty about spending money on bike parts, with two major exceptions, tires and chain/sprockets. Not having to adjust the chain every week, noise, wearing out the sprockets, etc... A little extra money spend now will save you money in the long run. No problem buying on Ebay as long as it's apples to apples. I have bought the same item cheaper online rather than Ebay. Don't settle for a lesser chain to save a few bucks now.
2004 KTM 950 ADV , 2006 DR-Z400E plated , 2001 YZ250N 2T woods bike , 1986 Yamaha FJ1200