It's really hard to guess on a price. To do so you have to look at similar tv's in the used market in your area.
For example, here in Calgary I couldn't sell a 32" CRT tv for more than $25. However, in Lethbridge (about 200km south), I can sell that same tv for no less than $100. So it's really dependent on the demand in the area and what people are willing to pay.
There is no set guideline for pricing old used equipment.
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