Sure, you can also try to sell them some snake oil. Caltrops and ball bearing have virtually no effect against anything that you would want to run away from. It only might be effective against the kinds of chumps that you could defeat easily, but even then you are trading an action to potentially slow someone else down for one round as they avoid your trap.
"Indeed, you are discerning customer, it helps if you have a way to move them onto your scattered caltrops like a shove or a thunderwave.
But someone of your sharp intellect and high social standing needs to buy my special invisibly Sequestered caltrops. Invisible caltrops coated with a special ruby dust. Because they can't be seen, You can't avoid them easily.
Yes, they must be yours, Sir. As you can imagine, they are quite an upgrade to my already excellent standard version caltrops. Ruby dust isn't cheap you know. Now, these aren't just plain, ruby-dust covered, invisible caltrops they are also precoated in silver. Do you know what that means, Sir?
Yes, you can use these caltrops. Against Lycans. Terrifying creatures that would be immune to my already excellent standard version caltrops. But
When you purchase these silver-coated invisible Caltrops. You would have a chance to survive a hungry Were and live to tell the tale.
Now, normally I don't even have these in stock, but I have one very special bag left.
And I know what your are thinking! Silver, Ruby, Invisible these have got to be worth 20,000 gp if not more. But, allow me to let you in on a little secret. I have an archmage who owes me a big favor, and so he gives me a break on the price of his truly fantastic transmutation.
Today, these Silver-coated, Ruby-dust covered, Invisibly sequestered, truly excellent caltrops could be yours for only 10000gp.
What do you say will you buy these before the Lycans show up?" - Tribulus the Caltrop merchant