A lot of people here are saying "just buy DTC, don't buy used/refurb." A HUGE caveat to this is that "used" and "refurb" are NOT the same thing. MyGolfSpy Ball Lab has pretty conclusively demonstrated that it's NEVER a good idea to buy refurbished balls, but used balls, in good condition, perform exactly like new ones.
DTC balls are great. If a DTC ball fits your swing profile, buy it. But if you can buy a dozen used, mint condition left-dash for $35 bucks, and if that's the ball that fits your swing profile, why compromise buying a DTC ball that may not fit your swing?