Over the years, ive owned boots manufactured by Scarpa, Zamberland and Brasher, and their insoles were alway's excellent quality.
The only other insoles ive found that offer value for money, quality wise, are those made by Sorbothane.
Their not really a bargain, but their amongst the best quality aftermarket insoles you can buy, and one can feel the excellent cushioning they provide, and because their well made, can take serious punishment.