TEX, put “Melitta Ready set Joe” in search at Amazon and they will come up. They are inexpensive. You can buy just the filter or the filter with the cup. I, too, have given these as Christmas gifts because they are so handy and the resulting coffee is great. The plastic filter uses a #2 paper filter. I have stacks of those paper filters in my preps.
I use mine anytime I want a cup of coffee. Since the hot water is going directly through the coffee and into the cup, there is no boiling or recirculating the coffee so you get pure coffee taste with one pass through.
Thank you so much!