Depends what you call affordable. When I see what some guys, even newbs pay for their rocks and razors I think 150 USD for a Nakayama is not bad. For that money So went out of his way to find a stone with the dimensions I specified. Part of the price is determined by the looks of the hone, not the quality. Mine has a few veins that do not affect results and that is why I got it relatively cheap.
At the end of the day: you don't need one. For a year I only had a coticule and was happy, then I bumped into an Escher and thought that was the best hone ever. Now I have a Nakayama and that is my best. Who knows what comes next?
I spend little on shaving cream, I always finish one tube or tub before opening the next one, am happy with a boar brush (have been using the same one for over 20 years), and spend zilch on colognes etc.