The problem is, I think, that the website shows the bass as 'sold' if someone buys it online, but if someone calls up to buy it then it'll show as in stock until someone manually updates the inventory.
I had the same worry when I bought a bass I was desperate to find. I paid online and called the next day to check if I was indeed first, half expecting that the item was gone already. I was lucky but it was hard to sleep that night!!
Just tell yourself that the bass could have been a dog and the right one will come along eventually...