The 300yd (274m) spools go for £21 or less at quite a few shops in the UK, R500 for 300m would be harsh...
I bought 1800m of 50lb Whiplash pro for £100 - cheapest you can get it in SA is R2100 I think.
Nominally you are paying at least 30% more for braid than they sell for in the UK. Factor in the difference in cost of living/average salary and you will find that someone living in the UK can buy twice the amount of braid you can in South Africa. This means that comparatively you are paying twice as much for your braid than someone in the UK.
Point being: It's time to start manufacturing these products that are unnecessarily imported in SA... Compared to importing, manufacturing will provide more job opportunities, have a positive effect on the GDP, and hopefully supply cheaper options to the local market - what more can you ask for?? It's time for a wake-up call people!