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Half hearted Google shows H&R uses Bilstein shocks. So anyone that can rebuild Bilstein *should* be able to do it. Additional Google for specifically H&R shows Performance Shock, Inc will rebuild H&R for $200/ea. It kinda depends on how the shock body is sealed, though.
While not 100%, a worn shock typically should not cause clunking and squeaking. That is normally strut mounts (the top plates.) Worn swaybar mounts are also a common source for those types of noises. I'm typically a fan of locating and identifying a specific worn part, rather than throwing a bunch of often unnecessary new parts at a car. When it's a shop doing the work though, it does often make more sense to have them only take it apart once and do everything.
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