I purchased a completely refurbished/rebuilt Revox PR99 MK2 from this company 2 years ago: https://www.techtrader.ch
Cost and shipping to the USA was very reasonable for a R2R tape deck this good that looks and performs like new. SQ is the very best I have ever heard. For example, Lyn Stanley 15ips RtR tape London With A Twist, Live At Bernie’s. Stupidly expensive, but, SQ second to none IMHO. Everyone who has heard this tape on my systems simply say "Wow, sounds like live music".
This website has a wealth of information on R2R machines and music on tape: