This post shows the summary of Gunbroker sales for Yugoslavian M59s and M59/66s for the year of 2015. 2015 is the year of the Yugo SKS as a large new import of M59/66 and M59s (including a few long barreled M59s) came in and went for sale at various retail outlets around the country. Yugos are constantly relegated to the red-headed stepchild in the SKS world as there are numerous perceived dings against them. M59s do not have chrome lined bores and poor storage, usage, and handling conditions combined with corrosive Yugo M67 ammo often result in sewer pipe bores and general poor condition rifles. Bored soldiers and lax discipline also lead to trench art on stocks that some collectors value, but turn many off to these variants. M59/66s have all these issues and additionally are often affected by poor performing gas systems and a general dislike of the added grenade launcher and associated features.
The general avg. of M59s was ~$415 for the year and M59/66s was ~$385. 299 gun sold in 10 months corresponds to ~359 guns extrapolated for the entire 12 month year. It's clear there is an order of magnitude more Yugos out there then there are Alby or Romys.
For the chart, the general trend of an avg. Yugoslavian SKS was positively sloped, gaining a miniscule ~$4 per month. The high sale price was skewed with the high dollar M59/66 Honor Guard rifles that brought the high sale prices up tremendously over the last 4 months of the year. I broke out the M59 avg. by itself (light blue line) to see if it diverged from the general average, but it appears to track the average pretty well with a typical M59 fetching a higher price than your avg. M59/66. I think the new imports and retail sale of the new imports served to keep a pretty good lid on prices of Yugos throughout the year and this cap won't be lifted until the retail supply of these guns runs out.