Expensive and very time consuming. PARTS at a reasonable price for one. A lot of the heads interchange. There are a lot of RtR nuts out there. I'm one of sorts. I use a direct head playback unit. It's still a matter of good source material.
You're almost better off making your own. The biggie is when you finally get to hear a great 15ips recording like Roy Orbison, or Old Blue Eyes and you wonder why they ever stopped producing it. I'm not a huge county western fan but the old "Opry", and the Outlaws had some really great tapes at one time. CCR, Carlos, Steppenwolf and one of my favorites on tape is Momma Cass. 2-600.00 is not uncommon.
Did I mention RtR is time consuming and VERY expensive.