I don't understand how discussing the price of a service is in bad taste. If so, then please refrain from ever discussing the value of a home, a car, a massage, a golf lessonn etc.
Aside from sex, politics, and religion (which are fantastic topics btw), now we need to add another forbidden topic. The more topics that are off-limits, the less interesting any forum becomes.
Let's talk about the weather then. Boy, it's been real cold this winter!