Prices of my amplifiers are calculated by cost of parts, shipping, taxes i.e. material costs and labor. I do not mark up material costs and the cost of my amplifiers reflects those costs plus the cost of my labor, typically $200-300 per amplifier, depending on complexity.
The prices listed on the product pages reflect the highest end, boutique quality component specifications finished with a quality cabinet. I can also quote you for a more modest spec with cheaper tubes, transformers and capacitors. I do not and will not use inferior quality parts even on my lower cost builds. Please inquire for a quote or recommendations.
My "shop" rate is $60 per hour. That includes any non-warranty repairs, upgrades, modifications, etc. It will also be applied to any custom design work, engineering or consulting.