Wow, signed in 2009 and now the first post
Really nice pictures indeed hehe! Gave you mine promotion. I guess you have been a special member with this statistic hehehe.
And on topic:
Yes you should definetly buy a milligram scale, in the internet they are really cheap. There is that one everyone uses, it is ~ 20 $ or 30 I dont remember.
And I would not worry that in shops the sales of those are monitored, it is just a regular product of them, they want people to buy it, so you are not depicted as a criminal just by buying a product of a chemistry store.
It is more common with reagents like nitric acid, then you have to give them a reason why you buy those, but of course a scale can not be used to build a bomb ;D Except you are Mc Gyver