Spink is interesting, but IMO mostly not in a good way these days. Still, one has to watch their offerings as occasionally something can be had quite reasonably as you have pointed out with excellent examples. Believe it or not, occasionally Heritage can be a source if you keep "your eyes peeled". I believe my 192A was the same coin that had been sold somewhat earlier for nearly twice as much.
Overall, very hard to find much in the way of bargains these days but entertaining to look. I guess compared to proof or high grade gold, some of the pennies and small silver have relatively escaped. In the latter series, a coin such as the 1893 Jub. 6d in top condition probably would not go for great money even though vastly scarcer than the Una gold....