Pardon the ignorance but what are the options for a 700c rear wheel without doing any cold setting?

I've seen a handful of online shops with budget priced alloy 700c wheels, like this. How decent are these to get started with? Would I be able (better off) to find a set of wheels at my co-op or used bike shop with the right spacing and of better quality?

Down the road I'll invest in a better quality rear wheel. For now, the front wheel with a dynamo is the priority.