You can mail the film to Dwayne's in Kansas. Their rates are reasonable.
Do not take your film to Walmart. Their send-out service may still go to Fuji, and if so, the results will be good, but there have been reports that Walmart no longer returns film to customers; just prints and scans on a CD. Can you imagine shooting slide film and only getting back scans?
Few places outside of pro labs do E6 anymore. That's why I suggest you send to Dwayne's, as they do a good job and the prices are not bad.