It is a touchy issue. Usually if a bike person is interested, they can and will find out for themselves. So, I will typically chat about the cost of an item. I may ballpark it with a non-cyclist or inquistivie family member.
It is too bad that my hobbies are a bit spendy. Fortunately my husband doesn't grimace too much, he understands the importance of buying good tools and not wasting money on something that won't do the job. On the other hand, he makes me really think about whether I truly NEED the next bicycle purchase. We're still working on establishing our home and working toward starting a family.
My other hobby is photography. Talk about another thing that inspires equipment envy among observers... "How much did THAT cost?"I really should try to make money with that hobby so that I can support my riding hobby.