How can I round the edges of a piece of wood?
I would expect that most retail outlets do not offer to run wood through a shaper or do router work. What you really want to look for is a crafts-person that has the tools to do this for you. 

If your intent is to avoid having to pay someone to do a project like this then take the opportunity to figure out how you can do it yourself. There are a number of options that you can investigate:


You could elect to purchase a router and bit that can cut the round over edge on the wood piece. This approach may not actually cost too much more than outright paying a crafts-person.
There are tool rental businesses that allow you to pay a small fee to use a tool for a day or half day. This is usually a fraction of the cost of buying a quality tool of your own.
There are lower cost hand tools that can be used to create a rounded over edge on a board. A nice sharp hand plane and a sand paper block can do the trick with a little time investment. 
You can ask around. You may very well find a friend or colleague that has the tools and would be more than willing to do the routing on your board. You may find it appropriate to offer a meal out or a visit to the pub as a return favor.