Shopsmith Forums

There are several pricing discussions at penturners.org.

They all boil down to 2-4 times your material costs.

The range is wide, from guys who just want to offset their hobby costs, to guys who make some money as a part time side business, to guys who make a full time living off their pens. Some guys are super detailed with spreadsheets covering super glue costs and whether it was on sale when they bought it. Other guys just roll it all in and call it a wash.

The result of most of those discussions is that if you are happy and the customer is happy, then you've done something right.

What culprit said.

Add to this your location and the venue for sales.
You will get more for a pen at a juried art show than a typical craft fair (Different customer base) but it will cost you more for a booth. Some people wholesale only so they don't have to deal with sales tax. Some people do consignment offerings at local shops. Some people do web sales through ebay and etsy or their own site. Some like me are strictly word of mouth.

If you want to do this (turning/woodworking) to supplement income, Do your homework and find out what is involved/required in your local area.

Good luck.