Before BM bought DaVinci and tied it to their hardware you were looking at over $200k to get you foot in the door w/Resolve. The 'budget' coloring software used to be FinalTouch which was $25k but then Apple acquired the company, rebranded the software as Apple Color and added it at no extra charge to the FCP suite. Baselight and Pablo coloring systems will still set you back a pretty penny. Heck, Baselight's plugin for FCP7 and Avid is $1000 and people, including myself, are excited about the potential there.
Control panels range from $1500 to over $30,000 (Resolve's panels are $30,000) and the $1500 price point is pretty new. Before the Tangent Wave came out 2-3yrs ago JLCooper had the least expensive panels and those would set you back about $5,000. Now, thanks in large part to Color, there is a growing sub-$5k market for panels.
For monitors, a 21" 8-bit Flanders Scientific is $2500 and, according to Flanders their monitors should never need manual calibration but in case they do you can always send them back for calibration at no cost other than shipping. The 24" HP DreamColor is also $2500 but it requires a few hoops to jump through to get it working correctly for video.
Allan Tepper has a number of articles at ProVideoCoalition.com that talk about the best ways to use a DreamColor as a color accurate video monitor.
It was only 6 or 7yrs ago that broadcast quality HD monitors ranged from $10,000 - $60,000 so something like the Flanders just seems awesome to me. For a while the least expensive but most accurate 'budget' solution was an original Matrox MXO ($999) coupled with a 23" Apple Cinema Display. A big downside was that the ACD would start drifting in as little as 8-12hrs but if you had this budget setup you probably weren't working with the most high paying clients. Considering how long in the tooth a 23" ACD would be today I wouldn't try this setup anymore.
W/regards to the prices, if you are making precision tools for a very small audience then it will just cost more. Manufacturing costs are higher because the tolerances are more stringent and the cost per unit is higher because your customer base is measured in the low thousands as opposed to hundreds of thousands or millions for consumer-oriented gear. Even on something like the Tangent Wave, which is aimed and a professional niche, the build quality is far below Tangent's higher end CP200 panels.