Sam is right - what are you gaving checked? Function, wear, hardness, abuse? I took enough smithing classes (more coming in the future) to where I know if a basic arm is like new, safe, functional, or worn out, but beyond that? The MOST important thing is a smith you know and trust and knows her (or his) 'stuff'... beyond that, its whatever the going rate is in your area. If I did a function check (someting I'm comfortable to do on most fiarms) at my shop and charged $75 I'd be laughed outta town because the going rate is about 1/2 that... yet in the city, I'd be swamped. So yeah, lotta variables, plus... what do you want checked? Headspace? Lugs Magnafluxed? Barrel scoped and spec'd? Sear Engagement confirmed and/or adjusted? Timing on your revolver checked and adjusted to your shooting style? Lotsa variables there.
OK, adding to this... 30 years, in what conditions? A friend can lok at them and go "eh, OK" or not... gotta know what to look at, and IMO I would be watching someone do it and LEARN, BABY, LEARN!!!!!
Case in point - my garand was kept in grease in a moist-air location, was put away right, and is still my tack drivin' baby... my 30-30 which was my brothers deerslayer was stored next to it, and was almost non-recoverable. So find someone who knows what to look AT and what to look FOR at each firearm... happy shooting, and congrats on the new collection!