I loaded my third book onto Smashwords and made the pricing on all three books “User chooses price”, which allows you to choose the price. The RRP is $4.95 for this class of book, but you can pay more or less or even zero.
This is actually something I’ve wanted to do for a long time.
Offer my services at the price people want to pay for it. If people get value from what they read, then they can (still offer to) pay me.