almost all ocean sand will be polluted in some way. so, you may have a problem no matter where you live.
as for the bagged sand... for that low price i would buy some and do a vinegar test on it. take some of the sand, and place it in a bowl. then pour some vinegar over the sand. if it fizzes then you have a calcium based aragonite sand. that is what you want. if it does not fizz, then you have a silica based sand.
silica sand will work in a tank, as it is not toxic to the fish, but it will not provide any natural pH buffering, like an aragonite sand will.
DIY stand and Hood,
Coralife Lunar Aqualight (4x65W),
60 LB Hirocks Base Rock, 40 LB LR 50/50 Keys/Gulf
150 LB Playsand (~3-4 in DSB)
2 x Blood Red Fire Shrimp, 2 x Cleaner Shrimp
2 x Black and White Percula Clown, 1 x Orange Spotted Blenny, 1 x Red Stripe High Fin Goby