I agree 100% with that! If you see something, you like it and really want it, buy it! You have to be quick when it comes to the more popular items.
A few years ago MCarter and I literally watched as a certain person (Orange Crush 81 anybody?) ran around and placed his business card on machines, Stoner Jr's in particular, and this meant that it was his and the sellers honored this.
Also, if you plan on buying something large, large enough that you won't want to lug it around the entire time, PARK AS CLOSE AS YOU CAN!