There has been very little technological change in wedges in recent decades. It's not like drivers where a good quality titanium headed club even from a budget brand is going to run $100 and up. With wedges, the biggest difference between a $30 club and a $130 club is often going to be the name on it. For some, it may be worth paying for forged rather than cast, but even that is more about "feel" than performance.
If you are willing to spend a little more and want get the most out of your investment, find yourself a good professional club fitter, before just buying off the shelf name brand products. If you are the point where you can spend $100 per club, you ought to also be willing to pay $100 for a comprehensive fitting session to find out what is best for your game. A good custom fitter/builder can probably even put together a full set of custom clubs tailored to your game for no more than the cost of an off the shelf set name brand set.
And there are some good bargains on quality name brands either used, or just buying slightly older models on clearance. But those can be less a bargain if all you can find is standard lengths and flex if that isn't the right fit for you. For wedges, length and flex may be a little less critical than with longer clubs, but there are also differences in things like bounce and grind that a club fitter (or good teachng pro) could help you with.