The shop at your skating rink is a good bet, though there are some mail order firms that carry conventional skates. Skating works well with music having a good strong beat. There's always the chance that they're sitting on a fence or willing to give something a try. The North Avenue Rollerway in Chicago, IL also has a Wurlitzer. The Wheels in Motion rink in Wharton, NJ has a Pipe Organ of unknown type.
Some skaters actually enjoy multiple modes.
If you're curious or want to try something new and different. The more comfortable you are with what you skate on now, the more frustrating the accomodation period. Most participant sports go though boom-bust cycles. If there's a good rink scene in your area that allows in-line skates, get them to come out a few times. They may find that it's a nicer way to learn and that music and company help.