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Unfortunately an inexpensive skimmer will most likely be rubbish and you'll have wasted your money. Worth investing in a good one - is it going in sump? Or HoB? How big is your tank?
What do you want to spend and how big is your tank? Look at bulk reef supply, dr foster and smith or the name of the skimmer you like and google it. Reef octopus, SWC or aqua remora are a few.
I don't use one on my 30 gallon i use a canister filter and I don't know if I will be using one on my new 125 Iam setting up. My lfs which is specialized in marine biology they use a refugium with a wet dry filter for there 180 or around that and it looks wonderful I didn't see a skimmer and there refugium probably wasn't bigger than a 20. I will ask him Saturday or so if I should add one but I would probably go with reef octopus if I could.