I bought my salt from Tesco - at 25p per kg bag, it's about the same as the large bags but much tidier.
You should be able to put the salt on when it's really fresh, and my latest skin was removed from the sheep at the end of August and still doesnt smell with salt on it, I've been working it a little at a time when I get the chance, but 6 weeks on it is still fresh under the salt!
PS purse=scrotum, I'd rather not have that kind of pennies in my purse though lol