The Seton Hall Prep (N.J.) versatile 6-8 senior forward, who is one of a few priority targets that also includes guard J.P. Prince and forward Ben McCauley, has narrowed his focus to N.C. State, Kansas, UCLA and Kansas.
Costner has already taken an official visit to UCLA and recently set up visit dates to N.C. State on Sept. 17 and Kansas the following weekend.
"I live 10 minutes away, so I don't really need to visit Seton Hall," Costner said. "I might – or I might not."
"Getting it down to four was good, but I'll be even happier when it's over with," he added. Costner said that he's had to turn away schools like Illinois, Maryland and Virginia – all of which have called recently with the hopes of earning a visit and a shot at landing him.
"I tell them that it's just too late," Costner said. "For me, it's about trust and loyalty."
Costner said that playing time and Marcus Melvin are the two biggest lures to Raleigh.
"I'm similar to Marcus Melvin in the way that I play," said Costner, whose father, Tony, played at St. Joe's. "He gets a lot of minutes and as long as I can get stronger, I can hopefully get his minutes when he leaves."
"Right now, going into these two visits, all the schools are the same," he added. "Everyone has an equal shot right now."