Could I have my business trip expenses paid for?

-If I were to travel to the Las Vegas ASD trade show in order to find products to sell online from the UK, is there somehow a way to have my expenses paid for as it would be business trip?Possibly, if you ask your boss who is sending you or if you make some sort of deal with the other product-sellers.
You have to pay for it as you are are self employed. You would then put this as a cost against your business.

UK