If you want help, I suggest you also give an approximate budget. There are way too many HDTVs out there now to choose from. Since you also want 120Hz (& I also presume, 1080p since this matters more than 120Hz), it will narrow it quite nicely. I'm not certain you will find a better priced and full featured 32" with those features anywhere else besides a warehouse type store.
Bob's advice to also consider Amazon is a good one, even though you may pay more than a big box store depending on the model. Their return policy is usually always quite liberal. Costco can be good too (see their warranties), but they obviously don't carry many models/brands.
Tips regarding the Sammy you are looking at: Don't buy it for the following features- full web browser (stinks), Connectshare (doesn't work well), Screen mirroring (flaky real world performance), SmartHub (streamer boxes work much better). That said, if the picture quality is good enough for your needs, along with having wifi built in & ample HDMI ports, I might be tempted to go for it at Costco's list price.
So I'm currently looking for a TV. I've shopped around stores, but many of the stores carry the same thing, or not what I'm looking for. I did come across a samsung 32" smart tv at costco that caught my eye, but I can't find any reviews on it (model # UN32H5201AF).
I'm looking for a 32", HDTV 1080P, Non-Smart or Smart, and I would like 120hz, but in store, it seems they don't carry many 120hz 32" TVs, they all seem to be 60hz.
I am on a tight buget, but at the same time, I want to make a good investment with a quality TV. The only downside to shopping online for a TV, is I can't see the TV in person to test it out. Any recommendations are welcomed, as are tips what to look for, and what to watch out for.

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