I am fascinated by money and what people spend on things. However, It is rude to ask direct questions, especially if the other person seems uncomfortable.
I field others’ inquiries with a variety of techniques including pretending not to hear, changing the subject and saying such things as, ‘I forget how much that cost,’ or, ‘Much too much, I am sure, or ‘ I will have to ask/ look it up and tell you later.’ I often turn the question round and say, ‘What did yours cost you?’
The thing to do is be prepared and have something to say well before the intrusive question arrives.