what does a simple but decent bicycle cost in a local store near you?

As the saying goes, it depends on what you're looking for: if you're looking for a simple "shoppers" bike to buzz around town, expect to pay about £150/ Euros for one in reasonable condition from a bike dealer knowing it has been fully serviced. However, always check out the private ads: if you're willing to take the risk, I got a 21 gear hybrid with full Shimano set for £100/Euros from a neighbour - it needed some TLC, but I have ridden about 1000 miles on her in two years.