I did a small experiment. I purchased Target playsand, SIL 7 sand and some store-brand sand.
Cost:
Store brand: A lot, over a dollar a pound.
SIL: $6.50 for 100 pounds
Target: About $6 per 50 pounds
ph: none seemed to change ph
Clean-ness:
Store bough and Target are almost identical. Fairly clean, but would reccomend a couple rinses. After rinsing a couple of times, both sands gave almost perfectly clear water after a few minutes. The SIL was very dirty and left a mucky water a day later.
Fines:
Store bought stuff was very uniformily graded. Not many fine sands. The SIL was a little bit finer than the Target.
I found the non-coloured Target stuff at Totem only. Home depot had target play sand but it was yellow. Rona had their own brand that was not cleaned/sanitized.
Only problem is I bought 100 pounds of playsand fro my 30 gal aquarium (oops). Ohh well, wasted five bucks.