How to ask if something is for sale?
How would one ask if something is for sale in japanese. Or even better, how would you ask if someone is welling to sell something they have.
Like how would I say "By chance, are you willing to sell this? If not, would you be willing to trade this for another group?"

I'd greatly appreciate help figuring out how to say this
Thank you

Question

How to ask if something is for sale?
How would one ask if something is for sale in japanese. Or even better, how would you ask if someone is welling to sell something they have. 
Like how would I say "By chance, are you willing to sell this? If not, would you be willing to trade this for another group?"

I'd greatly appreciate help figuring out how to say this
Thank you

Answer

それは売り物ですか。　is that for sale?

Answer

失礼ですが、
あなたの〇〇を譲って頂いたり、
交換して頂いたりすることはできませんか？

譲る is literally "give" but also euphomism for "sell".