求翻译：图86的四臂观音刺绣唐卡、图91绿度母刺绣唐卡都是工艺非常漂亮的唐卡，也难找到，你的美国朋友买价太低了。其中图86四臂观音刺绣唐卡的卖价我们还是按照店铺开业5年前的价格提供，现在市场上这种品相的唐卡远远高于我们提供的价格。是什么意思？

Figure 86 four-armed goddess of mercy embroidery Thangka, Figure 91 technology of green Tara embroidery Tangka is very nice Thangka, also difficult to find, your United States friend purchase price was too low. # 864 arm Yin embroidery Tangka price shop opened 5 years ago we did as price now this Thangka of the Condition on the market much higher than the price we offer.