The cheapest throw line from arborist suppliers is much less expensive than Amsteel. 1/8" polypropolene, for example, from Wesspur. (Slick and Target
are the product names @ <$.10 / ft.
(I have listed excess Spectra / Dyneema 1.75mm throw-line to get rid of at less than than price + shipping, after outfitting half a dozen tarps. )
I am sure that nacra533 will not buy lousy mason's line. But, there is some terrible stuff sold as mason's line in the big box home improvement stores, right down there with untempered hammers and similar.